[Part 1: Biological Sciences] || Macromolecular Crowding Allows Blunt-End Ligation by DNA Ligases from Rat Liver or Escherichia coliSteven B. Zimmerman and Barbara H. Pheiffer · Proceedings of the National Academy of Sciences of the United States of America · 1983

[Part 2: Biological Sciences] || A RNA· DNA Hybrid That Can Adopt Two Conformations: An X-Ray Diffraction Study of poly(rA)· poly(dT) in Concentrated Solution or in FibersSteven B. Zimmerman and Barbara H. Pheiffer · Proceedings of the National Academy of Sciences of the United States of America · 1981

Two Empires or Three?Ernst Mayr · Proceedings of the National Academy of Sciences of the United States of America · 1998

The Objects of SelectionErnst Mayr · Proceedings of the National Academy of Sciences of the United States of America · 1997

Generalized Riemannian GeometryLuther P. Eisenhart · Proceedings of the National Academy of Sciences of the United States of America · 1962

On Monothetic GroupsPaul R. Halmos and H. Samelson · Proceedings of the National Academy of Sciences of the United States of America · 1942

Stochastic Speculative PricePaul A. Samuelson · Proceedings of the National Academy of Sciences of the United States of America · 1971

Supplement || Front MatterProceedings of the National Academy of Sciences of the United States of America · 1983

Supplement || Biological Sciences Subject IndexProceedings of the National Academy of Sciences of the United States of America · 1983

Supplement || Physical Sciences Subject IndexProceedings of the National Academy of Sciences of the United States of America · 1983