| Unidentified photographer Photogrammetry photograph taken with a photo-theodolite and showing the compass setting n.d. Black and white image Smithsonian Institution Libraries LL/48190 Casella, L[ouis P.], 1897 (ca) Description of the the Bridges-Lee New Patent Photo-Theodolite, with full Instructions as to it manipulation in the field (London: L. Casella)
Manual - Smithsonian, Trade Literature, Scientific Instruments
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