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_:vb7271020
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[H]ere in America there are mountains of oil rock which can be blasted and steam-shoveled and transported by gravity to great retorts which will turn out oil and fertilizer in limitless quantities.
dcterms:bibliographicCitation
1918 February, Guy Elliott Mitchell, “Billions of Barrels of Oil Locked up in Rocks”, in Gilbert H[ovey] Grosvenor, editor, National Geographic, volume XXXIII, number 2, Washington, D.C.: National Geographic Society […], →ISSN, →OCLC, page 205, column 2: