Philadelphia: Willis & Clements, [1880 - 1910]. Single sheet, 7 x 23 inches, accordion folded to make 14 printed pages. Very good. Item #53505
Essentially a trade catalog, which provides general instructions for processing and presenting Willis & Clements' various platinotype papers, with a price list for the papers and various mounts, and cards.
Roosens and Salu No. 8638, listing an 1885 edition of 24 pp.