| Altemus & Co. (Philadelphia) Altemus & Co., Blank Books and Photograph Album Manufactury 1867 Advert Google Books LL/34968 Published in "Philadelphia and its Manufactures: A Hand-Book of the Great Manufactories and Representative Mercantile Houses of Philadelphia in 1867" by Edwin Troxell Freedley (Philadelphia: Edward Young & Co., 1867), p.160.
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