Here's a link to an old thread I saved on JD McCarthy Pictures & Postcards (as Bob calls them):
http://www.net54baseball.com/showthread.php?t=173693
Note he indicates when he was alphabetizing them, that of the JD McCarthy Pictures & Postcards he purchased, he had 225 subjects in the letters "A - F". I imagine the final list of player photos will be quite large. It is interesting to note he indicated that players felt they had really made it when McCarthy took their pictures. McCarthy ended up with quite an extensive compilation of pictures of players that never made it or only made it to the majors briefly - which is another reason McCarthy photo's are interesting.
Z Wheat