This fonds contains files relating to St. Barbe's family, as well as his personal correspondence, autobiographical material, his forestry and conservation activities (including Men of the Trees and the Sahara Reclamation Program), and his involvement with the Baha'i faith. While the collection as a whole covers the full span of St. Barbe’s life, 1889-1982, the bulk of the material dates from post-World War II, much of the earlier material apparently having been lost to German bombs in England during the war.

The series contains correspondence, notes, programmes, addresses, speeches, circulars, newsletters, lists, minutes and prayers pertaining to St. Barbe Baker's religious beliefs and life style.

The series contains correspondence, certificates, legal documents, diaries, lists, notebooks, visitor books, financial records and miscellaneous material relating to Baker's personal life.

The series contains a variety of material that did not fit in preceding series.

The series contains correspondence, lists, notes, manuscripts, addresses, speeches, and publicity material pertaining to the literary activities of St. Barbe Baker.

The series contains correspondence, drafts, articles, annual reports, lists, speeches, addresses, financial records, printed and publicity material pertaining to various forestry and conservation activities of St. Barbe Baker such as Trees for Palestine, the New Earth Charter, Tree Sunday, Year of the Child, Year of the Tree, Children of the Green Earth, Friends of Nature, Sahara Reclamation Company, Nigeria, World Forestry Congress and World Forestry Charter Gatherings.

The series contains correspondence received by St. Barbe Baker including some draft and copies of his replies. Correspondence pertaining to a specific activity or topic covered elsewhere in this fonds has been filed in the appropriate series, while letters of a more general nature and those covering more than one topic are kept in this series.

The series contains files relating to autobiographical and biographical information on St. Barbe Baker.