University of Guyana Library Search for 'se:International encyclopedia of unified science,'

Fundamentals of concept formation in empirical science.-

Chicago, University of Chicago Press 1952 . iii, 93 p. 25 cm..

Chicago, Ill., The University of Chicago press 1939 . 59 p.

Chicago, University of Chicago Press, 1970 . xii, 210 p. 24 cm.. 0226458032

Chicago University of Chicago Press 1938 . 59p.

(Chicago, Univ. of Chicago P.) 1939 . iii, 81 p.,

Chicago: University of Chicago Press, 1952 . iv, 102p.-

Chicago : The Univ. of Chicago P., 1970 . xii, 210 p. 0226458040 (pbk)