The unity of science,

By Carnap, Rudolf,. London, K. Paul, Trench, Trubner & co., ltd., 1934 . 101 p. , Originally "appeared in Erkenntnis (vol. II, 1932, pp. 432-465) under the title 'Die physikalische sprache als universalprache [!] der wissenschaft,' and has been revised, by the author, for this edition."-p. 10. 15.5 cm..

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The nature of mathematics

By Black, Max. London: Routledge & Kegan Paul; 1933 . xiv, 219p. : , Includes index & bibliography. 20cm..

Place Hold on The nature of mathematics

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The unity of science,

The nature of mathematics