International encyclopedia of unified science
University of Chicago Press
v. 1-2 (in 20 title): Foundations of the unity of sciences
by Rudolf Carnap
University of Chicago Press c1939 International encyclopedia of unified science v. 1-2 . Foundations of the unity of science ; v. 1, no. 3
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Otto Neurath ... [et al.]
University of Chicago Press 1938 International encyclopedia of unified science v. 1 . Foundations of the unity of science ; no. 1
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Charles W. Morris
Univiersity of Chicago Press 1938 International encyclopedia of unified science v. 1-2 . Foundations of the unity of science ; v. 1 ; no. 2
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by Victor Lenzen
University of Chicago Press 1938 International encyclopedia of unified science Vols. 1. & 2 . Foundations of the unity of science ; v. 1 ; no. 5