Columbia subject headings:
Harvard subject headings:
Photography--Printing processes--Gum-bichromate
Photography--Printing processes--Gum-bichromate--Handbooks, manuals, etc.
Photogravure
Photogravure--Handbooks, manuals, etc.
Princeton subject headings:
Photography--Printing processes--Gum-bichromate.
Photogravure.