Consists of diaries, correspondence, documents and documents created or collected during, or in the immediate aftermath, of World War II, primarily relating to the 4th Battalion Northumberland (Hexham) Home Guard. Also includes documents relating to Brown's time assisting in the training of the Royal Northumberland Fusiliers Army Cadet Force.

Consists of correspondence, memorabilia, documents and artefacts created or collected during, or in the immediate aftermath, of World War I.

Consists of invitations, pamphlets and programmes relating to events celebrating soldiers returning from war, and in particular those who were released from Prisoner of War camps.

Consists of letters and programmes in relation to the Tyneside Scottish Association which formed after World War I to bring together and to remember soldiers who had served with the Tyneside Scottish regiment.

Consists of comics and journals that are reprinted editions of those originally printed during World War I, or are related to World War I.

Consists of published booklets and articles written about the history of World War I. Includes Bovril's 'War Diary' and a booklet on the history of the Northumberland Fusiliers.

Consists of photographs, correspondence, maps, research and histories, created after World War I.

Consists of poems and paintings that were collected by Thomas Baker Brown and which relate to World War I.

Consists of photographs of scenes of France following bombing raids, as well as weaponry. Some are reproductions produced by the Imperial War Museum in South Kensington, London, others are postcards produced in France.

Consists of photographs of Thomas Baker Brown in uniform.