Are these worth more than silver content?

Welcome to Numista. I think so but you probably wont realize much of a premium over melt. To silver stackers or bullion dealers , they might offer you melt value or even slightly less. To those who are collectors that want or need one of these to fill a hole in their collection, they would probably offer you a modest premium over melt. It's up to the individual. Lets face it, they are not highly collectable in their present condition.

1921 D Morgan Dollar

1901 P Barber Quarter

1906 P Barber Dime

For common U.S. coins I usually go look on eBay.  

You will be able to find these coins in similar condition, and then can do the math on eBay fees, shipping costs, etc., and get the answer.  

For instance, the dime has sold for $4 with free shipping.  That nets you only $2.44 after eBay fees and the cost of a first class stamp, which is better than melt but hardly justifies the effort.   

And so on …