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In 2011 I reviewed the calculation by Onsager and Kaufman of the spontaneousmagnetization of the square-lattice Ising model, which Onsager announced in1949 but never published. I have recently been alerted to further originalpapers that bear on the subject. It is quite clear that the draft paper onwhich I relied was indeed written by Onsager, who was working on the problemwith Kaufman, and that they had two derivations of the result.

Onsager and Kaufman's calculation of the spontaneous magnetization of the Ising model: II