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Boudewijn Gerrit Verselewel De Witt Hamer, Papers
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Correspondence, prospectors' licences, reports, prospectus, press cuttings and other documents relating to mines including the Royal Sheba (Eureka, 'Transvaal), Boschkop Copper Mine, Elandsriver, and the Independent Gold Mining Co.

Malaria

Correspondence and press cuttings relating to the discovery of the transmission of malaria by the anopheles mosquito, Includes an article. 'Die Oorwinning op die anopheles' by Harm Oost who believed that De Witt Hamer was the first man to prove that the mosquito had a role in the spreading of malaria.

Barberton

Documents relating to Barberton, including press cuttings, agreement re recruitment of 'kaffers' 1899, prospectus of Barberton Wanderers' Club, letter appointing De Witt Hamer as a delegate to the Municipal Conference in Pretoria. 1903, correspondence re mining, contract of lease for a property in Barberton, powers of attorney, prospectus of Barberton Banket Beds Syndicate, other correspondence.

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