1. Hydraulic O-ring Packing for Sealing Cylinders and Pistons.;Allen;Product Engineering,July 1947
2. Mechanical Seals for Rotating Shafts.;Burger;Aircraft Engineering,March 1947
3. Chicago Belting Company 1945 Handbook on Hydraulic and Pneumatic Leather Packings.
4. Fuel Pumps for Aeroplanes.;Clothier;Proc. Inst. Automobile Eng.,1937
5. Frictional Properties of Oil Seal Materials.;Forrester;Engineering,August 1947