Notebook containing 'The present state of the theory of natural selection' by J B S Haldane, apparently unpublished., [?1933.], MS.20593. 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/44225 Accessed September 25, 2024.