Hello,
Currently, the RPC reference refers to both the online catalogue and the published books.
However, this is not used consistently on Numista, which mixes publication years, publishers, and reference numbers for the online and physical catalogues. However, the online and physical references are not 100% overlapping. There are many coins added online that are not present in the printed catalogues (example).
A similar situation occurs with RIC and OCRE, which have different codes on Numista.
So, I propose that the RPC reference should also be split. We would need the current references to be kept for the online catalogues and RPC I, II, III, VII.1, VII.2, and IX + the supplements to be added as physical books.
For the physical books we would need these added:
Code: RPC I
Authors: Andrew M. Burnett, Michel Amandry, Pere Pau Ripollès
Title: Roman Provincial Coinage
Volume: Volume 1. From the death of Caesar to the death of Vitellius (44 BC–AD 69)
Subtitle: Part I. Introduction and catalogue
Publisher: British Museum Press - Bibliothèque nationale de France
Publication location: London, United Kingdom - Paris, France
Publication year: 1992
ISBN-10: 714108715
ISBN-13: 9780714108711
OCLC number: 490380489

Code: RPC I
Authors: Andrew M. Burnett, Michel Amandry, Pere Pau Ripollès
Title: Roman Provincial Coinage
Volume: Volume 1. From the death of Caesar to the death of Vitellius (44 BC–AD 69)
Subtitle: Part II. Indexes and plates
Publisher: British Museum Press - Bibliothèque nationale de France
Publication location: London, United Kingdom - Paris, France
Publication year: 1992
ISBN-10: 2717718451
ISBN-13: 9782717718454
OCLC number: 490380519
Code: RPC II
Authors: Andrew Burnett, Michel Amandry, Ian Carradice
Title: Roman Provincial Coinage
Volume: Volume 2. From Vespasian to Domitian (AD 69–96)
Subtitle: Part I. Introduction and catalogue
Publisher: British Museum Press - Bibliothèque nationale de France
Publication location: London, United Kingdom - Paris, France
Publication year: 1999
ISBN-10: 714108987
ISBN-13: 9780714108988
OCLC number: 469048935

Code: RPC II
Authors: Andrew Burnett, Michel Amandry, Ian Carradice
Title: Roman Provincial Coinage
Volume: Volume 2. From Vespasian to Domitian (AD 69–96)
Subtitle: Part II. Indexes and Plates
Publisher: British Museum Press - Bibliothèque nationale de France
Publication location: London, United Kingdom - Paris, France
Publication year: 1999
ISBN-10: 2717720863
ISBN-13: 9782717720860
OCLC number: 469048935
Code: RPC III
Authors: Michel Amandry, Andrew M. Burnett, Jérôme Mairat, William E. Metcalf, Laurent Bricault, M. Blet-Lemarquand
Title: Roman Provincial Coinage
Volume: Volume 3. From Nerva to Hadrian (AD 96–138)
Subtitle: Part I. Catalogue
Publisher: British Museum Press - Bibliothèque nationale de France
Publication location: London, United Kingdom - Paris, France
Publication year: 2015
ISBN-10: 714118273
ISBN-13: 9780714118277
OCLC number: 944950839

Code: RPC III
Authors: Michel Amandry, Andrew M. Burnett, Jérôme Mairat, William E. Metcalf, Laurent Bricault, M. Blet-Lemarquand
Title: Roman Provincial Coinage
Volume: Volume 3. From Nerva to Hadrian (AD 96–138)
Subtitle: Part II. General introduction, indexes and plates
Publisher: British Museum Press - Bibliothèque nationale de France
Publication location: London, United Kingdom - Paris, France
Publication year: 2015
ISBN-10: 714118273
ISBN-13: 9780714118277
OCLC number: 944950927
Code: RPC VII.1
Author: Marguerite Spoerri Butcher
Title: Roman Provincial Coinage
Volume: Volume 7.1. From Gordian I to Gordian III (AD 238–244): Province of Asia
Publisher: British Museum Press - Bibliothèque nationale de France
Publication location: London, United Kingdom - Paris, France
Publication year: 2006
ISBN-10: 714118133
ISBN-13: 9780714118130
OCLC number: 62891768

Code: RPC VII.2
Authors: Jérôme Mairat (editor), Marguerite Spoerri Butcher (editor), Michel Amandry, Roger Bland, Kevin Butcher, Jack Nurpetlian, Ulrike Peter
Title: Roman Provincial Coinage
Volume: Volume 7.2. From Gordian I to Gordian III (AD 238–244): All Provinces Except Asia
Subtitle: Part I
Publisher: British Museum Press - Bibliothèque nationale de France
Publication location: London, United Kingdom - Paris, France
Publication year: 2022
ISBN-10: 271772303X
ISBN-13: 9782717723038
OCLC number: 795831192

Code: RPC VII.2
Authors: Jérôme Mairat (editor), Marguerite Spoerri Butcher (editor), Michel Amandry, Roger Bland, Kevin Butcher, Jack Nurpetlian, Ulrike Peter
Title: Roman Provincial Coinage
Volume: Volume 7.2. From Gordian I to Gordian III (AD 238–244): All Provinces Except Asia
Subtitle: Part II
Publisher: British Museum Press - Bibliothèque nationale de France
Publication location: London, United Kingdom - Paris, France
Publication year: 2022
ISBN-10: 0714118133
ISBN-13: 9780714118130
OCLC number: 795831192
Code: RPC IX
Authors: Anthony Hostein, Jérôme Mairat
Title: Roman Provincial Coinage
Volume: Volume 9. From Trajan Decius to Uranius Antoninus (AD 249–254)
Subtitle: Part I. Introduction and catalogue
Publisher: British Museum Press - Bibliothèque nationale de France
Publication location: London, United Kingdom - Paris, France
Publication year: 2016
ISBN-10: 071411829X
ISBN-13: 9780714118291
OCLC number: 947152778

Code: RPC IX
Authors: Anthony Hostein, Jérôme Mairat, Edoardo Levante
Title: Roman Provincial Coinage
Volume: Volume 9. From Trajan Decius to Uranius Antoninus (AD 249–254)
Subtitle: Part II. Indexes, maps and plates
Publisher: British Museum Press - Bibliothèque nationale de France
Publication location: London, United Kingdom - Paris, France
Publication year: 2016
ISBN-10: 2717727108
ISBN-13: 9782717727104
OCLC number: 949259406
Code: RPC S.I–III
Authors: Pere Pau Ripollès, Andrew Burnett, Michel Amandry, Ian Carradice, Marguerite Spoerri Butcher
Title: Roman Provincial Coinage
Subtitle: Consolidated Supplement I-III (1992–2015)
Publisher: British Museum Press - Bibliothèque nationale de France
Publication location: London, United Kingdom - Paris, France
Publication year: 2015
ISBN-10: 1910807060
ISBN-13: 9781910807064
OCLC number: 1006185353
WEB: http://rpc.ashmus.ox.ac.uk/supp/rpc_cons_supp_1-3.pdf

Code: RPC S.4
Authors: Michel Amandry, Andrew Burnett, Antony Hostein, Jerome Mairat, Pere Pau Ripollès, Marguerite Spoerri Butcher
Title: Roman Provincial Coinage
Subtitle: Supplement 4 (Volumes I, II, III, VII.1 and IX)
Publisher: British Museum Press - Bibliothèque nationale de France
Publication location: London, United Kingdom - Paris, France
Publication year: 2017
ISBN-10: –
ISBN-13: –
OCLC number: 1012937725
WEB: http://rpc.ashmus.ox.ac.uk/supp/rpc-supp-4.pdf

Code: RPC S.5
Authors: Michel Amandry, Andrew Burnett, Antony Hostein, Jerome Mairat, Pere Pau Ripollès, Marguerite Spoerri Butcher
Title: Roman Provincial Coinage
Subtitle: Supplement 5 (Volumes I, II, III, VII.1 and IX)
Publisher: British Museum Press - Bibliothèque nationale de France
Publication location: London, United Kingdom - Paris, France
Publication year: 2019
ISBN-10: –
ISBN-13: –
OCLC number: 1097553510
WEB: http://rpc.ashmus.ox.ac.uk/supp/rpc-supp-5.pdf

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And the current RPC catalogues should be changed to this:
Code: RPC (online) I
Authors: Andrew M. Burnett, Michel Amandry, Pere Pau Ripollès
Title: Roman Provincial Coinage
Volume: Volume 1. From the death of Caesar to the death of Vitellius (44 BC–AD 69)
Edition: online
Publisher: Ashmolean Museum
Publication location: University of Oxford, United Kingdom
Publication year: 2019
Website: https://rpc.ashmus.ox.ac.uk/
Code: RPC (online) II
Authors: Andrew Burnett, Michel Amandry, Ian Carradice
Title: Roman Provincial Coinage
Volume: Volume 2. From Vespasian to Domitian (AD 69–96)
Edition: online
Publisher: Ashmolean Museum
Publication location: University of Oxford, United Kingdom
Publication year: 2019
Website: https://rpc.ashmus.ox.ac.uk/
Code: RPC (online) III
Authors: Michel Amandry, Andrew M. Burnett, Jérôme Mairat, William E. Metcalf, Laurent Bricault, M. Blet-Lemarquand
Title: Roman Provincial Coinage
Volume: Volume 3. From Nerva to Hadrian (AD 96–138)
Edition: online
Publisher: Ashmolean Museum
Publication location: University of Oxford, United Kingdom
Publication year: 2015
Website: https://rpc.ashmus.ox.ac.uk/
Code: RPC (online) IV.1
Author: Volker Heuchert
Title: Roman Provincial Coinage
Volume: Volume 4.1. From Antoninus Pius to Commodus (AD 138–192): Cyrenaica to Bithynia-Pontus
Edition: online
Publisher: Ashmolean Museum
Publication location: University of Oxford, United Kingdom
Publication year: 2005
Website: https://rpc.ashmus.ox.ac.uk/
Code: RPC (online) IV.2
Author: Volker Heuchert
Title: Roman Provincial Coinage
Volume: Volume 4.2. From Antoninus Pius to Commodus (AD 138–192): Asia
Edition: online
Publisher: Ashmolean Museum
Publication location: University of Oxford, United Kingdom
Publication year: 2005
Website: https://rpc.ashmus.ox.ac.uk/
Code: RPC (online) IV.3
Author: Volker Heuchert
Title: Roman Provincial Coinage
Volume: Volume 4.3. From Antoninus Pius to Commodus (AD 138–192): Lycia-Pamphylia to Arabia
Edition: online
Publisher: Ashmolean Museum
Publication location: University of Oxford, United Kingdom
Publication year: 2005
Website: https://rpc.ashmus.ox.ac.uk/
Code: RPC (online) IV.4
Author: Chris Howgego
Title: Roman Provincial Coinage
Volume: Volume 4.4. From Antoninus Pius to Commodus (AD 138–192): Egypt
Edition: online
Publisher: Ashmolean Museum
Publication location: University of Oxford, United Kingdom
Publication year: 2005
Website: https://rpc.ashmus.ox.ac.uk/
Code: RPC (online) VI
Authors: Dario Calomino, Andrew M. Burnett
Title: Roman Provincial Coinage
Volume: Volume 6. From Elagabalus to Maximinus Thrax (AD 218–238): Asia Minor and Egypt
Edition: online
Publisher: Ashmolean Museum
Publication location: University of Oxford, United Kingdom
Publication year: 2017
Website: https://rpc.ashmus.ox.ac.uk/
Code: RPC (online) VII.1
Author: Marguerite Spoerri Butcher
Title: Roman Provincial Coinage
Volume: Volume 7.1. From Gordian I to Gordian III (AD 238–244): Province of Asia
Edition: online
Publisher: Ashmolean Museum
Publication location: University of Oxford, United Kingdom
Publication year: 2016
Website: https://rpc.ashmus.ox.ac.uk/
Code: RPC (online) VII.2
Authors: Jérôme Mairat (editor), Marguerite Spoerri Butcher (editor), Michel Amandry, Roger Bland, Kevin Butcher, Jack Nurpetlian, Ulrike Peter
Title: Roman Provincial Coinage
Volume: Volume 7.2. From Gordian I to Gordian III (AD 238–244): All Provinces Except Asia
Edition: online
Publisher: Ashmolean Museum
Publication location: University of Oxford, United Kingdom
Publication year: 2020
Website: https://rpc.ashmus.ox.ac.uk/
Code: RPC (online) VIII
Authors: Jérôme Mairat (editor), Marguerite Spoerri Butcher (editor), Michel Amandry, Kevin Butcher, Edoardo Levante, Jack Nurpetlian, Ulrike Peter
Title: Roman Provincial Coinage
Volume: Volume 8. Philip (AD 244–249)
Edition: online
Publisher: Ashmolean Museum
Publication location: University of Oxford, United Kingdom
Publication year: 2020
Website: https://rpc.ashmus.ox.ac.uk/
Code: RPC (online) IX
Authors: Anthony Hostein, Jérôme Mairat, Edoardo Levante
Title: Roman Provincial Coinage
Volume: Volume 9. From Trajan Decius to Uranius Antoninus (AD 249–254)
Edition: online
Publisher: Ashmolean Museum
Publication location: University of Oxford, United Kingdom
Publication year: 2014
Website: https://rpc.ashmus.ox.ac.uk/