International Union of Geological Sciences publication
International Union of Geological Science
by J.H. Shergold ... [et al.]
International Union of Geological Sciences 1985 International Union of Geological Sciences publication no. 19
: pbk
Available at 1 libraries
by B.D. Webby ... [et al.] ; compiled and edited by B.D. Webby ; sponored by the International Subcommission on Ordovician Stratigraphy
IUGS Secretariat , IUGS Editorial Office 1981 International Union of Geological Sciences publication no. 6