The SciencesDecember 1, 1941
How to Make a Mastodon
Students of Paleontology Reconstruct a Model of Amebelodon from Fossils
Stories by C. Stuart Johnston
The SciencesAugust 1, 1939
Flint Flaking
The Amateur Workman, as He Practices, Can Progress in Days through the Same Stages of Skill for which his Ancestors Required More Than 100,000 Years of Gradual Invention