VAN KREVELEN, D. (1961). Coal: Typology chemistry-physics. Elsevier.
Tohutoru Kātū Chicago (17th ed.)VAN KREVELEN, D.W. Coal: Typology Chemistry-physics. Amsterdam: Elsevier, 1961.
Tohutoro MLA (9th ed.)VAN KREVELEN, D.W. Coal: Typology Chemistry-physics. Elsevier, 1961.
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