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OF THE

NATIONAL RESEARCH

COUNCIL

VOLUME 10

March 1925, to March 1926, inclusive

PUBLISHED BY THE NATIONAL RESEARCH COUNCIL

OF

THE NATIONAL ACADEMY OF SCIENCES

WASHINGTON, D. C.

1925 - 1926

5-54

CONTENTS

NUMBER 51

Radioactivity. Pp. 203. By A. F. Kovarik and L. W. Mckeehan

NUMBER 52
Honors courses in American Colleges and Universities, Pp. 96.

By Frank Aydelotte NUMBER 53

Transactions of the American Geophysical Union, Sixth Annual

Meeting, April 30 - May 1, 1925, Washington, D. C. Pp. 80.

NUMBER 54

Quantum principles and line spectra. Pp. 316. J. H. Van Vleck

602618

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