- 1Ralph Arnold; V. R. Garfias; A. Pollard
The prevention of waste of oil and gas from flowing wells in California, with a discussion special methods used by J. A. Pollard
Washington, D.C.: Gov. Print. Off. 1914; 15 S.; Ill. - 2Ralph Arnold; V. R. Garfias
Methods of oil recovery in California
Washington, D.C.: Gov. Print. Off. 1914; 57 S.; Ill.