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Publication Extents

Not all publications have extents, not all extents are completely accurate
Relations between local magnetic disturbances and the genesis of petroleum
George Ferdinand Becker
1909, Bulletin 401
No question in geology is more obscure than that of the origin of the numerous natural hydrocarbons commonly classified as asphalt, ozokerite, petroleum, and natural gas. Certain facts of occurrence and certain results of experiment are indeed established, but the interpretation to be placed upon them is so doubtful that...