| The Ferrotyper's Guide 1873 Advert Google Books LL/35321 This advert was in John Towler The Silver Sunbeam: A Practical and Theoretical Text-Book on Sun Drawing and Photographic Printing, Eighth edition (New York: E. & H.T. Anthony & Co., 1873), in the appended 1873 catalogue for Benerman & Wilson's Photographic Publications.
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