- P. Swings and O. Struve
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Two Interesting Nuclei of Planetary Nebulae: IC 418 and NGC 40
PNAS 1941 27: 225-229.
[PDF]
- S. F. Carson, J. W. Foster, S. Ruben, and H. A. Barker
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Radioactive Carbon as an Indicator of Carbon Dioxide Utilization. V. Studies on the Propionic Acid Bacteria
PNAS 1941 27: 229-235.
[PDF]
- A. L. LeRosen, F. W. Went, and L. Zechmeister
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Relation Between Genes and Carotenoids of the Tomato
PNAS 1941 27: 236-242.
[PDF]
- Richard Courant
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On the First Variation of the Dirichlet-Douglas Integral and on the Method of Gradients
PNAS 1941 27: 242-248.
[PDF]
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