[21]Ernst Antevs, personal communication, 1946.
[22]Kirk Bryan, “Geologic Antiquity of Man in America.” Science, new ser., 93:505-514 (1941).
[23]Carl Sauer, “Early Relations of Man to Plants,” Geographical Review, 37:10 (1947).
[24]Erwin H. Barbour and C. Bertrand Schultz, “Paleontologic and Geologic Consideration of Early Man in Nebraska,” Bulletin, Nebraska State Museum, 1:431 (1936).
[25]George F. Carter, The Idea of the Recency of Man in America (unpublished MS.).
[26]Albrecht Penck, “Wann kamen die Indianer nach Nordamerika?” Proceedings, 23rd International Congress of Americanists (1930), 23-30.
[27]H. V. Walter, A. Cathoud, and Anibal Mattos, “The Confins Man: A Contribution to the Study of Early Man in South America,” in Early Man (1937), 345.
[28]Kirk Bryan, “Correlation of the Deposits of Sandia Cave, New Mexico, with the Glacial Chronology,” Appendix to Hibben, “Evidences of Early Occupation in Sandia Cave” (Smithsonian Miscellaneous Collections, no. 23, 1941, vol. 99), 69.
[29]Ernst Antevs, “Correlation of Wisconsin Glacial Maxima,” American Journal of Science, 243A:29 (1945) and “Dating Records of Early Man in the Southwest,” American Naturalist, 70:336 (1936). Chart in Gladwin, Excavations at Snaketown, 2:73. “Climatic History and the Antiquity of Man in California,” Reports of the University of California Archaeological Survey, 16:23-29 (1952).
[30]Antevs, “Climate and Early Man in North America,” in Early Man, 128, and “Dating Records, etc.,” 333.