PNAS (Proceedings of the National Academy of Sciences of the United States of America)是美国科学院的院刊，是继Nature, Cell, Science之后的四大名刊之一。该期刊于1915年1月正式推出第一期（创刊时间其他地方介绍为1914年），收录涵盖医学、化学、生物、物理、大气科学、生态学以及社会科学的最新前沿进展。在几几年之前（还没看到那个时候），该期刊为月刊，之后成为周刊。
下面从期刊成立初期查看，当前浏览的内容有关人类学（Anthropology）、统计学（Statistics）等领域。
April 01, 1915; vol. 1 no. 4
题目：The Diffusion of Horse Culture Among the North American Indians
作者：Clark Wissler
摘要：https://www.pnas.org/content/1/4/254
July 01, 1915; vol. 1 no. 7
题目：The Distribution and Functions of Tribal Societies Among the Plains Indians
作者：Clark Wissler
摘要：https://www.pnas.org/content/1/7/401
June 01, 1920; vol. 6 no. 6
题目：On the Rate of Growth of the Population of the United States since 1790 and Its Mathematical Representation
作者：Raymond Pearl and Lowell J. Reed
摘要：https://www.pnas.org/content/6/6/275
July 01, 1920; vol. 6 no. 7
题目：The Dynamics of a Fluctuating Growth Rate
作者：H. S. Reed
摘要：https://www.pnas.org/content/6/7/397
August 01, 1920; vol. 6 no. 8
题目：The Influence of Environment upon Development
作者：Franz Boas
摘要：https://www.pnas.org/content/6/8/489
October 01, 1922; vol. 8 no. 10
题目：A Further Note on the Age Index of a Population
作者：Raymond Pearl and T. J. LeBlanc
摘要：https://www.pnas.org/content/8/10/300
November 01, 1922; vol. 8 no. 11
题目：The Stability of the Normal Age Distribution
作者：Alfred J. Lotka
摘要：https://www.pnas.org/content/8/11/339
December 01, 1922; vol. 8 no. 12
题目：A Further Note on the Mathematical Theory of Population Growth
作者：Raymond Pearl and Lowell J. Reed
摘要：https://www.pnas.org/content/8/12/365
February 01, 1925; vol. 11 no. 2
题目：The Population of New York City and Its Environs
作者：Edwin B. Wilson and Willem J. Luyten
摘要：https://www.pnas.org/content/11/2/137
October 01, 1925; vol. 11 no. 10
题目：The Distribution of Correlation Ratios Calculated from Random Data
作者：Harold Hotelling
摘要：https://www.pnas.org/content/11/10/657
October 01, 1926; vol. 12 no. 10
题目：Social Selection in a Mixed Population
作者：Melville J. Herskovits
摘要：https://www.pnas.org/content/12/10/587
March 01, 1928; vol. 14 no. 3
题目：On Hierarchical Correlation Systems
作者：Edwin B. Wilson
摘要：https://www.pnas.org/content/14/3/283
今日份“形式打卡”完毕，1915-1930相关的Mark一下。