TY - BOOK T1 - Plays for assessment in Region IV, Rocky Mountains and Northern Great Plains as of October 4, 19931995 National assessment of oil and gas / DA - 1993. CY - Denver, Colo. : AU - Gautier, Donald L. AU - Varnes, Katharine L. VL - 93-596-D CN - I 19.76: PB - U.S. Dept. of the Interior, U.S. Geological Survey ; PB - [Books and Open-File Reports Section, distributor], PP - Denver, Colo. : PY - 1993. N1 - Distributed to depository libraries in microfiche. N1 - Shipping list no: 94-0789-M. ID - 197035 KW - Petroleum reserves KW - Petroleum reserves KW - Natural gas reserves KW - Natural gas reserves TI - Plays for assessment in Region IV, Rocky Mountains and Northern Great Plains as of October 4, 19931995 National assessment of oil and gas / ER -