Conjectures and refutations : the growth of scientific knowledge / by Karl R. Popper. Popper, Karl R. (Karl Raimund), 1902-1994. Methodology. Knowledge, Theory of. Science Methodology. Prediction (Logic) BD241 .P65x 1968 121 POC Includes bibliographical references and indexes. New York : Harper & Row, 1968, c1965. 1968, c1965. 1968 Text xiii, 417 p. ; eng Harper torchbooks ; TB 1376