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ROBERT DAVIS LONGYEAR
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Journal Article

Example of Deflecting Diamond-Drill Holes

ROBERT DAVIS LONGYEAR
Published: 01 August 1930
AAPG Bulletin (1930) 14 (8): 1059–1063.
DOI: https://doi.org/10.1306/3D93290A-16B1-11D7-8645000102C1865D
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Diamond Drills and Diamond-Drill Equipment for Oil Structure Investigation

Robert Davis Longyear
Published: 01 July 1926
AAPG Bulletin (1926) 10 (7): 656–666.
DOI: https://doi.org/10.1306/3D93272F-16B1-11D7-8645000102C1865D
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Journal Article

The Diamond Drill in Oil Exploration

Robert Davis Longyear
Published: 01 March 1922
AAPG Bulletin (1922) 6 (2): 98–111.
DOI: https://doi.org/10.1306/3D9325CD-16B1-11D7-8645000102C1865D
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