As geology is essentially a historical science, the working method of the — Reinout Willem van Bemmelen
Experiments in geology are far more difficult than in physics and chemistry — Reinout Willem van Bemmelen
[The] subjective [historical] element in geologic studies accounts for two characteristic types — Reinout Willem van Bemmelen
Geology differs from physics, chemistry, and biology in that the possibilities for — Reinout Willem van Bemmelen