by James A. Calkins ... [and others] ; prepared in cooperation with the Geological Survey of Pakistan, under the auspices of the Government of Pakistan and the Agency for International Development, U.S. Department of State
by Thomas A. Brühwiler ... [and others]. Middle and late Smithian (early Triassic) ammonoids from Spiti, India / by Thomas A. Brühwiler, Hugo Bucher and Leopold Krystyn