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Holograph manuscript: 'What is a Gene' by R B S Haldane, 23 pp.

Holograph manuscript: 'A Theory of Structural Changes in Chromosomes', by J B S Haldane, 25pp., includes a rough illustration for 'My Freind Mr Leakey' by J B S Haldane, Cresset Press, London, 1937.

Holograph manuscript: 'A Theory of Chromosomal Rearrangements' by J B S Haldane, 16 pp.