C.C. Schoonmaker, n.d., Backmark for "Extensive Photographic Establishment of Schoonmaker & Co., 282 River Street, Troy, N. Y.", Paper cover for tintype mount (?), back, Private collection of Robert Shimmin, LL/64027

C.C. Schoonmaker, n.d., Backmark for "Schoonmaker, Photographer, And Dealer in photographic goods, Chemicals, Glass, &c., 282 River Street, Troy, N. Y.", Paper cover for tintype mount (?), back, Private collection of Robert Shimmin, LL/64026

C.C. Schoonmaker, n.d., Business card for C.C. Schoonmaker - "Daguerreotypes by Steam for the Million", Business card, Archives of Modern Conflict OR National Gallery of Canada, LL/9852