“Even more difficult to explain, than the breaking-up of a single mass into fragments, and the drifting apart of these blocks to form the foundations of the present-day continents, is the explanation of the original production of the single mass,… — Amadeus William Grabau Copy Share Image
“Even more difficult to explain, than the breaking-up of a single mass into fragments, and the drifting apart of these blocks to form the… — Amadeus William Grabau Copy Share Image
