Note 293 — Introductory material (continued 4)
Reading edition
United States Department of the Interior. "Petroleum," by Joseph D. Weeks, p. 300. Annual Oil Supplement to Oil City Derrick, 1893 and 1894.
Reading edition
United States Department of the Interior. "Petroleum," by Joseph D. Weeks, p. 300. Annual Oil Supplement to Oil City Derrick, 1893 and 1894.