From a series of articles published in The Philadelphia Photographer, beginning in February 1871 on Ross lenses.
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Another article on Ross' lens manufactory, published in The Philadelphia Photographer, December 1874.
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An 1864 Catalogue listing for Ross lenses from the book, Practical photography: On Glass and Paper. Published by Negretti and Zambra, Opticians and Photographic instrument makers: London: 1864
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| 1864 Catalogue listing |
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| 1867 Advertisement |
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| 1883 Advertisement |
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| 1900 Advertisement |
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