This correspondence consists mainly of letters from and to De Witt Hamer, many of which are in Dutch (some with English summaries supplied by Mrs Barclay. daughter of De Witt Hamer). Subjects include complaints about conditions at the camp, the tracing of missing persons, the selling of artefacts made by P.O.W.s, the delivery to camps in St Helena of comforts provided for Boer prisoners, the entertainment of prisoners, the questions of parole or release. The letters are in no particular order. There is a file containing letters by Dr. Plowright, a British supporter of the Boer cause, and one personal correspondence between De Witt Hamer, his wife, his brother in Holland and others. Other correspondents include the Netherlands Consulate and the Red Cross.

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.

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.

Including:
A1.1 Extracts regarding life & career of B. G. Verselewel de Witt Hamer born in 1855 - 1930
A1.2 BORGACTE - 1885
A1.3 B.G. Verselewel De Witt Hamer information from : 1886 - 1897
A1.4 Marriage certificate of Boudewyn Gerrit Verselewel De Witt Hamer to Gladys Disteli on the 10th April 1897
A1.5 Government - Office in Pretoria 27th November 1894
A1.6 Restaurant Riche Amsterdam Menu 31 March 1896
A1.7 Parcel to be send to Museum in Barberton 1898
A1.8 Department van Buitenlandsche Zaken 1st October 1898
A1.9 Diary of Commandant B.G. de Witt Hamer later vesion written in Russia 5th November 1899
A1.10 Telegram 18th January 1900
A1.11 Camp Simon Town 9th February 1900
A1.12 Letter from A.G.Mawatle captain for Staff Officer for Prisoners Warder to B.G.De Witt Hamer 26th April 1900
A1.13 Passport for Mrs. Hamer 18th May 1900
A1.14 Cheque from Gladys Verselewel De Witt Hamer 28th September 1900
A1.15 Permission is granded to Captain de Witt Hamer to visit General L. Cronje at Kamp Cottages 13th January 1901
A1.16 A letter to Miss Disdelli 28th March 1901
A1.17 A cheque received by Gladys de Witt Hamer 25th April 1901
A1.18 Train ticket was received by Miss Distelli from B.G. De Witt Hamer 25th April 1901
A1.19 Permission is granded to Captain de Witt Hamer to visit General L. Cronje at Kamp Cottages 7th May 1901
A1.20 Special Pass for Wickel Gate 11th January 1902
A1.21 Meeting of Captain de Witt Hamer with General Cronje at Kamp Cottages 2nd April 1902
A1.22 Draft message of P.O.Ws St. Helena to be sent to the King & Queen Allendse,England 15th April 1902
A1.23 Letter to Honourable Colonel Commanding Troops Deadwood Camp 15 April 1902
A1.24 Donors are specially requested not to send clothing from houses where there has been illness 28th July 1902
A1.25 Prisoner of War St. Helena 29 August 1902
A1.26 The fruits of our sacrifices 20th October 1902
A1.27 Permit to enter and reside in the Transvaal and Orange river colony 24th December 1902