Journal Article Conservation and the Gospel of Efficiency: The Progressive Conservation Movement, 1890–1920. By Samuel P. Hays. Harvard Historical Monographs, XL. (Cambridge: Harvard University Press, 1959. xii + 297 pp. Notes, bibliographical note, and index. $6.00.) Get access Elmo R. Richardson Elmo R. Richardson University of Kansas Search for other works by this author on: Oxford Academic Google Scholar Journal of American History, Volume 46, Issue 4, March 1960, Pages 737–738, https://doi.org/10.2307/1886312 Published: 01 March 1960
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Richardson et al. (1960) studied this question.