267
James G. Speight, Natural Gas: A Basic Handbook (Houston: Gulf Publishing Company, 2007), 22.
268
Nor-Afidah Abd Rahman, «Street Lighting,» Singapore Infopedia, 1998, .
269
Kevin Hillstrom and Laurie Collier Hillstrom, The Industrial Revolution in America: Iron and Steel (Santa Barbara: ABC–CLIO, 2005), 107.
270
Derickson, Dangerously Sleepy.
271
Ibid.
272
United States, Supreme Court, Women in Industry: Decision of the United States Supreme Court in Curt Muller Vs. State of Oregon, Upholding the Constitutionality of the Oregon Ten-Hour Law for Women and Brief for the State of Oregon, 1908, .
