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This journal provides immediate access to some articles. Volume 38(4); April 1952 Astronomy Magellanic Clouds: III. Differential Absorption Within the Large Cloud PMCID: PMC1063548 Magellanic Clouds: IV. On the Period Frequency Anomalies PMCID: PMC1063549 Genetics Breakage of Chromosomes by Oxygen PMCID: PMC1063550 Mutant Isoalleles at the Vermilion Locus in Drosophila Melanogaster PMCID: PMC1063551 Geophysics On the Early Chemical History of the Earth and the Origin of Life PMCID: PMC1063561 Mathematics The Paracompactness of the Weak Simplicial Complex PMCID: PMC1063552 Some Problems Involving Primitive Roots in a Finite Field PMCID: PMC1063553 On Analytic Surfaces with Two Independent Meromorphic Functions PMCID: PMC1063554 Cohomology Groups of Abelian Groups and Homotopy Theory IV PMCID: PMC1063555 The Apparition Problem for Equianharmonic Divisibility Sequences PMCID: PMC1063556 Some Theorems on Piecewise Linear Embedding PMCID: PMC1063557 Plancherel Formula for the 2 × 2 Real Unimodular Group PMCID: PMC1063558 On Solutions of Maxwell's Equations in an Exterior Region PMCID: PMC1063559 On Cohomology Theories PMCID: PMC1063560 Physics Some Comments on the London-Brooks Treatment of Diamagnetic Anisotropy PMCID: PMC1063562 π-Electrons and σ-Electrons PMCID: PMC1063563 On the Anomalous Transparency of Thick Crystals to X-Rays PMCID: PMC1063564 Correction On a Theorem of Hardy, Littlewood, Polya and Blackwell PMCID: PMC1063565 Corrects: On a Theorem of Hardy, Littlewood, Polya, and Blackwell. Proc Natl Acad Sci U S A. 1951 December; 37(12): 826–831. Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||
