Revision history of "On the spot. (In Detective story magazine, Apr. 25-May 30, 1931) (Pub. abroad in Sunday pictorial, Dec. 7, 1930-Mar. 22, 1931) chap.1-4, chap.5-7, chap.8-11, chap.12-17, chap.18-21, chap.22-24" (Q28203)
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