The SciencesJune 1, 1952
The History of a River
The Ohio is comparatively young. The course of its predecessor, mightier than the Mississippi, has now been traced by the work of many geologists and even exploited for the benefit of man
Stories by Raymond E. Janssen
EnvironmentJuly 1, 1948
The Beginnings of Coal
The remains of strange and beautiful plants have preserved solar energy of the geologic past for the uses of man