The letters have been listed and grouped by Dr. Robert Baldock (who also provided the information for this entry) as follows:
Northern Rhodesia 1948 - 1954: during this period Barlow was a secretariat officer in Lusaka. The letters cover his arrival as a bachelor officer, and include descriptions of methods of work, administrative personnel, political events and social activities, including amateur theatricals (a particular interest). A strong element is the clear disapproval of the administrative cadre of the settler community, their political activities and their racial policies. Of special interest is his opposition to contemporary moves towards the Central African Federation which he thought was not in the interests of the Africans. Correspondents include Sir Gilbert Rennie (Governor of N. Rhodesia), (Sir) Robert Stanley (Chief Secretary), Bishop Robert Selby Taylor (Bishop of N. Rhodesia and later Archbishop of Cape Town), and (Sir) Roy Welensky and (Sir) Arthur Creech Jones (Colonial Secretary)
Kenya 1954 - 1958: Barlow was less happy in the Kenya colonial administration.
Political questions in Kenya are raised in the letters and (Sir) Michael Blundell features prominently.
Northern Rhodesia/Zambia 1958 - 1972: As a former colonial civil servant with wide social activities, and now a major personality in the Anglican Church, Barlow moved within a remarkably broad circle during this happy period of his life. The letters contain an obvious concentration on ecclesiastical activities, and a continuing theme is his personal interest in the training and education of African ordinands. He came frequently into contact with Africans and travelled widely in the rural areas as well as to the major towns. From 1960 his area of interest extended to cover the Federation.