The SciencesFebruary 1, 1930
How Old Is the Earth?
How Geologists, Physicists, Geophysicists, and Other Scientists Are Pooling Their Knowledge for a Combined Attack on This Ever-fascinating Problem
How Old Is the Earth?
How Geologists, Physicists, Geophysicists, and Other Scientists Are Pooling Their Knowledge for a Combined Attack on This Ever-fascinating Problem
Among Our Contributors, February 1930