Petroleum /
Petri, D.
Petroleum / D. Petri. - Oxford : The University Press, 1961. - 86 p. : illus. ; 23 cm.
Includes bibliographical references.
Petroleum.--------
665.5 PET
Petroleum / D. Petri. - Oxford : The University Press, 1961. - 86 p. : illus. ; 23 cm.
Includes bibliographical references.
Petroleum.--------
665.5 PET