HAC: The Harold Acton Collection, New York University Florence

APA: The Acton Photograph Archive, New York University Florence

LPL: La Pietra Library, New York University Florence

LWT: London Weekend Television Archive

VLP CO: Villa La Pietra Collection Office

BNCF: Biblioteca Nazionale Firenze

FCRF: Fondazione Cassa di Risparmio Firenze

ca: Albumin paper

ct: cyanotype

clt: collotype

fi: photogravure

gsa: gelatin paper with silver salts

nlg: Gelatin plate negative

np: negative on film

plg: gelatin plate positive

scc: color chromogenic printing

sgb: gum bichromate printing

st: letterpress printing