The modern practice of retouching negatives, as practiced by M. Piquepé and other experts, French, English and American (1882)
Piquepé, P. (Paul), Piquepé, P. (Paul). Traité pratique de la retouche des clichés photographiques. English. Selections · New York : Scovill Manufacturing Company · leaf 76
PITTSBURGH, PA., … OF EVERY DESCRIPTION, CARD STOCK, APPARATUS, CHEMICALS, Etc. XXVIII
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
