Adams to S. R. Callaway, Aug. 17, 1885, UP, PO, OC, vol. 31, ser. 2, r. 27.
Mill, Auguste Comte, 24, 38, 77.
Mill, Auguste Comte, 94, 96.
Mill, Auguste Comte, 149.
Thomas Andrews, Killing for Coal: Americas Deadliest Labor War (Cambridge: Harvard Uni. Press, 2008).
Kathleen A. Brosnan, Uniting Mountain & Plain: Cities, Law, and Environmental Change along the Front Range (Albuquerque: Univ. of New Mexico Press, 2002).