Showing 1 - 2 results of 2 for search '"mainspring"', query time: 0.02s Refine Results
  1. 1

    Mainsprings of civilization / by Huntington, Ellsworth, 1876-1947

    Published 1959
    Book
  2. 2

    The mainspring of human progress / by Weaver, Henry Grady, 1889-1949

    Published 1953
    Book