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(The dates of publication of the separate chapters are given in parentheses)
Plate I. Map of western Texas and adjoining territory, showing the
location of wells that have furnished potash data-
centage of potash present, and character of material pene-
VI. Monthly fluctuations in output of bituminous coal and in
volume of trade, 1905–1923.
28. Monthly average spot prices of bituminous coal f. o. b. mines,