Fritz Zwicky. "On a New Type of Reasoning and Some of Its Possible Consequences", a letter to the editor in Physical Review, vol. 43, Issue 12, pp. 1031-1033. In the original printed wrappers. Good copy, though with a splotch of red ink on the spine. Full text online here. $150
Abstract: "On a principle of flexibility of scientific truth -- From a deeper scrutiny of the foundations of scientific truth it follows that every scientific statement referring to observations should possess a certain minimum degree of flexibility. In other words, no set of two-valued truths can be established with the expectation that this set ultimately will stand the test of experience. Formulations of scientific truth intrinsically must be many-valued..."--from Caltech Authors, here.
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