Hi All,
We have the 87X lens that we use for the microbook collection of American Civilization and Early English Lit the LAC & LEL collection.   This 87X lens won't work on white opaque microcards which we have for Zoological Record 1864-1948 and Royal Society of London proceedings, 1800-1945.
I hope someone has information on readers for this type of card.
Thanks again,

Mary Wepasnick
Periodical Dept.
St. Bonaventure Library
St. Bonaventure, NY 14778
mjwep@sbu.edu