Why are mountain-regions apt to be sparsely peopled?
Why are arid regions sparsely peopled, as a rule?
Why are not gold-mining settlements so apt to be permanent as agricultural settlements?
From the Abstract of Statistics find the production of gold and silver of this region for each ten years ending the last half of the century.
What causes the difference between the wool clip of southern California and that of the Eastern States?
Follow the route of a grain-carrying ship from San Francisco to Liverpool.
What are the advantages to the United States of the accession of the Hawaiian Islands?—of the Philippine Islands?—of Alaska? What are the disadvantages?
FOR COLLATERAL READING AND REFERENCE
Mineral Resources of the United States.
Abstract of Statistics.