The reference catalog list says Schön listings are based on the 2000 47th edition but that version isn't published and the page on the publisher's web site has large red letters saying:
!!! Erscheinungstermin auf unbestimmte Zeit verschoben !!!
Translation: !!! Release date postponed indefinitely !!!
Gerhard Schön; 2018. Weltmünzkatalog / 20. Jahrhundert: 1901-2000 (46. Auflage). Battenberg Gietl Verlag, Regenstauf, Germany.