Within the last few years the search for crude oil has become world wide. It is not likely that new extensive areas yielding petroleum in commercial quantities will be discovered in the United States, except, perhaps, in the southwestern states, which are now being tested. Pools may be developed from lower horizons in some of the old fields, but the limit to our oil resources appears to be in sight. Attention must be turned, therefore, to possible future supply from foreign fields.
Of the remainder of North America, much is already known of the vast quantities of oil in Mexico,...
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