I've found two listed. The United States Early Silver Dollars from 1794 to 1803, 2nd Edition by M. H. Bolender The United States Early Silver Dollars, 1794-1803 by Jules Reiver Is one the preferred reference? I want one that lists the varieties and how to identify them. Or is there a better one than those two? Also there appears to be two different sets of variety identifiers: BB- and B-. I didn't find anything about them.