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Reproductions of the correspondence between Herbert Lang and Richard Tjader and others in relation to the Lang-Chapin Expedition to the Congo (1909-15) and receipt of specimens at the American Museum of Natural History. 5800 mammal specimens were collected. Collection housed at the AMNH, New York.

The Congo Expedition:

https://digitallibrary.amnh.org/bitstream/handle/2246/1587//v2/dspace/ingest/pdfSource/bul/B039intro.pdf?sequence=1&isAllowed=y