Helen Megaw left her papers in store at Girton College in two batches, one in 1977 and one in November 1980. The papers were largely arranged by Helen Megaw herself and she left a partial list to the papers stored in 1980. They were all transferred from store to archives in 2000. They relate largely to her research, writing and teaching. There is very little of a personal and biographical nature other than letters written to her in the 1950s by family and friends and some biographical notes.
The catalogue contains many chemical formulae and other scientific symbols. These have been represented accurately in the text as far as possible: however, any advice relating to errors or suggestions for improvement would be gratefully received.