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The Silver Sunbeam: A Practical and Theoretical Text-Book on Sun Drawing and Photographic Printing: Comprehending All the Wet and Dry Processes at Present Known, with Collodion, Albumen, Gelatin, Wax, Resin and Silver; As [Sic] Also Heliographic Engravin - Scholar's Choice Ed by John Towler (Paperback / softback, 2015)