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Cultivator.
Patent for a cultivator with spring teeth that are stronger than ordinary cultivator teeth.
Date:
December 8, 1908
Creator:
Baker, Alonzo L. & Baker, Russell
Object Type:
Patent
System:
The Portal to Texas History
Recovery of Oil in California By Secondary Methods: In Two Parts - Part 1. San Joaquin Valley Oil Fields
Report issued by the U.S. Bureau of Mines on the study of secondary-recovery methods of oil production in California. The report discusses methods and properties of this type of oil production, focusing on air injection. This report is in two parts, and contains tables and maps.
Date:
July 1952
Creator:
Loomis, A. G.; Fried, A. N. & Crowell, D. C.
Object Type:
Report
System:
The UNT Digital Library