| Unidentified photographer/creator Knell's Patent Photographic Furniture. At reduced prices. 1871 Magazine page Google Books LL/35813 Supplement to the Photographer's Friend: A Priced Catalogue of Photographic Requisites of Superior Excellence, Furnished by Richard Walzl, Baltimore, Md., p.xviii in The Photographer's Fiend (Baltimore), Vol.1, 1871
| |