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| | Pioneer Photography in Bolivia: Directory of Daguerreotypists & Photographers, 1840s-1930s |
 | | A German geologist, mountain climber, and photographer, Ahlfeld immigrated to Bolivia in 1924 and settled in Cochabamba. |
 | | Bolivia" appears on a portrait of a gentleman inscribed "Monteagudo, abril 3, 1909." The Pérez archives, some 40,000 glass plates, are owned by the Pérez brothers successor, Alberto Castillo. |
 | | Singewald was professor of economic geography at Johns Hopkins University and co-leader, with Edward W. Berry, of the school's 1919 George Huntington Williams Memorial Expedition to the Andes of Peru, Bolivia, and Chile. |
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