Fletcher, Ruth R.; Wehmiller, J. F.; Martin, Ronald E.; Johnson, B. J. (1991): Comparative planktonic foraminiferal aminostratigraphy of the Colombia Basin and the Northeast Gulf of Mexico. American Association of Petroleum Geologists, Tulsa, OK, United States, In: Anonymous, AAPG 1991 annual convention with DPA/EMD divisions and SEPM, an associated society, 75 (3), 575, georefid:1991-059373