Four volumes comprising the unpublished and subsequent published memoirs by Donald Welbourn. The unpublished memoirs comprise two large typed vols: "An Engineer and his ancestors: Memoirs of his father and family from c. 1600" with accompanying images and an early obituary for the author. It reports on his life and career including time as Fellow at Selwyn with descriptions of other Fellows. The published volumes are entitled, "An Engineer in Peace and War: A Technical and Social History; Also description of new portrait of him commissioned by Fellowship 2006