Notebooks of J B S Haldane containing papers on various topics intended for publication as popular articles., 1933., MSS.20590-20591. Correspondence, papers and notebooks of J B S Haldane and correspondence and papers of his second wife Helen, née Spurway., MSS.20534-20654. National Library of Scotland Archives and Manuscripts Division. https://nlssb.as.atlas-sys.com/repositories/2/archival_objects/44221 Accessed September 23, 2024.