This series consists of 31 files containing reports and printed material relating to Edward Appleton's research. It is presented as follows: Coll-37/G.1-G.22 - Preprints or reports of limited circulation, briefly described, in chronological order; Coll-37/G.23-G.25 - Data sent to Edward Appleton from observatories and ionospheric stations, in alphabetical order; Coll-37/G.26-G.31 - Offprints of published papers by authors other than Appleton.