96. Hess, R. H., Foundations of National Prosperity, p. 100.
96. Hess, R. H., Foundations of National Prosperity, p. 100.
97. Report Nat’l Museum, 1904, pp. 189–733.
97. Report Nat’l Museum, 1904, pp. 189–733.
98. Featherstonhaugh, J. D., Am. Geol., 3, 220, 1889.
98. Featherstonhaugh, J. D., Am. Geol., 3, 220, 1889.
99. Whitney, Mineral Wealth of the United States, pp. 248–250.
99. Whitney, Mineral Wealth of the United States, pp. 248–250.
100. Foster and Whitney, 31st Cong., 1st session, House Doc. 69, pp. 13–14, 1850.
100. Foster and Whitney, 31st Cong., 1st session, House Doc. 69, pp. 13–14, 1850.
101. First Annual Rept. U. S. Geol. Survey, p. 4.
101. First Annual Rept. U. S. Geol. Survey, p. 4.
102. Wheeler, Report 3d Internat’l Geog. Cong., p. 492, 1885.
102. Wheeler, Report 3d Internat’l Geog. Cong., p. 492, 1885.
103. The views of the writer on “natural monopolies” in the Government service are set forth in an address delivered at the centennial celebration of the U. S. Coast and Geodetic Survey, April 5, 1916. (See Science, vol. 43, pp. 659–665, May 12, 1916.)
103. The views of the writer on “natural monopolies” in the Government service are set forth in an address delivered at the centennial celebration of the U. S. Coast and Geodetic Survey, April 5, 1916. (See Science, vol. 43, pp. 659–665, May 12, 1916.)
104. For correspondence on this subject, see Minnesota Geol. Survey, Eighth Ann. Rept., 1880, p. 173.
104. For correspondence on this subject, see Minnesota Geol. Survey, Eighth Ann. Rept., 1880, p. 173.
105. Owen, D. D., 30th Cong., 1st sess., Senate Doc. No. 57, p. 7, 1848.
105. Owen, D. D., 30th Cong., 1st sess., Senate Doc. No. 57, p. 7, 1848.
106. This essential difference between present-day requirements and the needs of earlier generations has been discussed by W. C. Mendenhall, the geologist in charge of the Land Classification Board of the Geological Survey: Proceedings 2d Pan-American Sci. Cong., 1915–16, 3, 761.
106. This essential difference between present-day requirements and the needs of earlier generations has been discussed by W. C. Mendenhall, the geologist in charge of the Land Classification Board of the Geological Survey: Proceedings 2d Pan-American Sci. Cong., 1915–16, 3, 761.