TY - RPRT TI - The occurrence and fission-track ages of late neogene and quaternary volcanic sediments, Siwalik group, Northern Pakistan AU - G.D. Johnson AU - P. Zeitler AU - C. W. Naeser AU - N.M. Johnson AU - D.M. Summers AU - C.D. Frost AU - N.D. Opdyke AU - R.A.K. Tahirkheli PY - 1982 DO - 10.1016/0031-0182(82)90058-x UR - https://pubs.usgs.gov/publication/70011875 ID - 70011875 ER -