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Q edit
If his book on Zermelo is so seminal, why is it held by so few libraries? [1] Tijfo098 (talk) 09:20, 18 April 2011 (UTC)
Mmkay, there are apparently multiple editions, and only one ISBN was given here, [2] Tijfo098 (talk) 09:22, 18 April 2011 (UTC)