Tanaka, Kenneth L. Magnetostratigraphy of the San Francisco volcanic field, Arizona / by K. L. Tanaka, T. C. Onstott and E. M. Shoemaker. - Denver : U. S. Geological Survey, 1990. - 35 p. : maps, tables ; 28 cm. - U.S. Geological survey bulletin ; 1929 . Supt. of Docs. no.: I 19.3:1929. Subjects--Topical Terms: Paleomagnetism--Arizona--Flagstaff region.Geology, Stratigraphic--Cenozoic.Volcanism--Arizona--Flagstaff region.