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Volume 33(4);  April 1947
The cover of the journal
Astronomy
On the Distribution of Titanium Oxide and Carbon Stars in Our Part of the Milky Way
Oliver J. Lee, Greenville D. Gore, and Thomas J. Bartlett
Proc Natl Acad Sci U S A. 1947 April; 33(4): 67–68.
PMCID: PMC1078992
Genetics
Hybridization Between Rana Pipiens From Vermont and Eastern Mexico
John A. Moore
Proc Natl Acad Sci U S A. 1947 April; 33(4): 72–75.
PMCID: PMC1078994
Mathematics
A Uniqueness Theorem for Eigenfunction Expansions
S. Minakshisundaram
Proc Natl Acad Sci U S A. 1947 April; 33(4): 76–77.
PMCID: PMC1078995
On the Characteristic Classes of Riemannian Manifolds
Shiing-shen Chern
Proc Natl Acad Sci U S A. 1947 April; 33(4): 78–82.
PMCID: PMC1078996
On the Functional Equation
C. Truesdell
Proc Natl Acad Sci U S A. 1947 April; 33(4): 82–93.
PMCID: PMC1078997
Pathology
The Spread of Measles in the Family
Edwin B. Wilson
Proc Natl Acad Sci U S A. 1947 April; 33(4): 68–72.
PMCID: PMC1078993
Journal Matter
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