The collection consists of two accruals. The first accrual comprises the fonds of Colonel Steer-Webster as well as the partial fonds of Michael Harrison, author of Mulberry: The Return to Triumph (1965). Michael Harrison has written over fifty books of fiction, biography, travel and history. It consists of typescripts, correspondence, charts, sketches, photographs, maps, models. The second accrual contains correspondence addressed to H. V. Phillips in the Ministry of Supply as well as photographs, plans and printed materials.