GAIN the United States turns hopeful eyes to the tropics of the Western Hemisphere in the search for essential raw materials, including those commercial forest and plantation crops which do not grow in our temperate climate. Lest we immediately take for granted that desire supported by the purse can easily cause springs to flow where drought has been perennial, let us examine the fruits of efforts made by Latin Americans and ourselves to increase the harvest of native rubber in the
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Edward Higbee (1951) studied this question.
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