- 1 Ralph Arnold; Frederick G. Clapp
Wastes in the production and utilization of natural gas and means for their prevention
Washington, D.C.: Gov. Print. Off. 1913; 29 S. - 2 Ralph 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. - 3 Ralph Arnold; V. R. Garfias
Methods of oil recovery in California
Washington, D.C.: Gov. Print. Off. 1914; 57 S.; Ill.