Meyer R.F. Definition and world resources of natural bitumens / R.F.Meyer,W.(jr)De Witt, 1990. - 14 p. - Текст : непосредственный.
Chemistry and mineralogy of natural bitumens and heavy oils and their reservoir rocks from the United States, Canada, Trinidad and Tobago, and Venezuela / J.W.Hosterman,R.F.Meyer,C.A.Palmer и др., 1990. - 19 p. - Текст : непосредственный.