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- Adam Matthew Digital (Firm), digitiser150
- General Sanford Memorial Library, associated with work73
- Musée royal de l'Afrique centrale66
- National Archives (Great Britain), associated with work48
- Académie royale des sciences d'outre-mer45
- Congo (Democratic Republic)43
- United States40
- Wildeman, E. de (Emile), 1866-194736
- ebrary, Inc34
- Morel, E. D. (Edmund Dene), 1873-192433
- Zaire31
- Project Muse28
- Institut national de la statistique (Zaire)27
- United States. Department of State26
- Institut national pour l'étude agronomique du Congo24
- Belgian Congo23
- Quirini, Pierre de23
- United States. Congress. Senate. Committee on Foreign Relations. Subcommittee on African Affairs22
- Heyse, Théodore, 1884-196321
- Congo (Democratic Republic), enacting jurisdiction20