"Photographic Facts And Formulas"@en . . . . . . . . . . . "Mathematical formulae"@en . "Mathematical formulae" . . "Tables" . "Tables"@en . . . . . . . . . . . . . . . . . . . . . . . . . . . "Photographic facts and formulas" . "Photographic facts and formulas"@en . "Photographic Facts and Formulas"@en . . "Photograhic facts and formulas" . . "Photographic Facts and formulas" . . . . . . . "Chimie photographique." . . . . "Photographie Traitement." . . "Fotografia Manuali." . . "Photographie Tirage." . . "Fotografia Processo chimico Manuali." . . "Photography." . .