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Table of Contents

May 01, 1948; vol. 34 no. 5

Astronomy

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Galactic and Extragalactic Studies
Harlow Shapley and Virginia McKibben Nail

PNAS May 1, 1948 34 (5) 173-179; https://doi.org/10.1073/pnas.34.5.173

Genetics

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A New Theory of Secondary Non-Disjunction in Female Drosophila Melanogaster
Kenneth W. Cooper

PNAS May 1, 1948 34 (5) 179-187; https://doi.org/10.1073/pnas.34.5.179
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The Origin of Volutin on the Chromosomes, Its Transfer to the Nucleolus, and Suggestions Concerning the Significance of this Phenomenon
Carl C. Lindegren

PNAS May 1, 1948 34 (5) 187-193; https://doi.org/10.1073/pnas.34.5.187

Mathematics

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Boundaries of ULC Sets in Euclidean n-Space
M. H. A. Newman

PNAS May 1, 1948 34 (5) 193-196; https://doi.org/10.1073/pnas.34.5.193
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Cyclotomic Power Characters and Trinomial Equations in a Finite Field
H. S. Vandiver

PNAS May 1, 1948 34 (5) 196-203; https://doi.org/10.1073/pnas.34.5.196
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The Stability of Differential Equations with Periodic Coefficients
Sylvan Wallach

PNAS May 1, 1948 34 (5) 203-204; https://doi.org/10.1073/pnas.34.5.203
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On Some Exponential Sums
André Weil

PNAS May 1, 1948 34 (5) 204-207; https://doi.org/10.1073/pnas.34.5.204
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On Spaces with Vanishing Low-Dimensional Homotopy Groups
George W. Whitehead

PNAS May 1, 1948 34 (5) 207-211; https://doi.org/10.1073/pnas.34.5.207

Physics

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Group Theoretical Discussion of Relativistic Wave Equations
V. Bargmann and E. P. Wigner

PNAS May 1, 1948 34 (5) 211-223; https://doi.org/10.1073/pnas.34.5.211

Psychology

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Stereoscopic Acuity for Various Levels of Illumination
C. G. Mueller and V. V. Lloyd

PNAS May 1, 1948 34 (5) 223-227; https://doi.org/10.1073/pnas.34.5.223

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