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1.
Conjectures and Refutations; the Growth of Scientific Knowledge; 0 by Popper, Karl R. (Karl Raimu... ISBN: 9781013388309 List Price: $32.95
2.
Conjectures and Refutations; the Growth of Scientific Knowledge; 0 by Popper, Karl R. (Karl Raimu... ISBN: 9781013507366 List Price: $21.95