Probably I should add to this:
"Matte gelatin printing-out papers (produced by adding resins, starches or clays to the normal emulsion formulae) were much used in the United States and were toned by the same techniques used for matte albumen paper, hence confusion between the two materials is possible."
http://albumen.conservation-us.org/l...lly/chap5.html
…which might explain the silver gelatin label on the Steichen prints.
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