These books may be borrowed from public libraries, or purchased from the publishers and retail book stores. At Columbia, the University Book Store, and the Missouri Store Co., sell most of them from shelf stock. Missouri Geology Publications Missouri has an excellent State Geological Survey which has published numerous volumes on various geologic topics and areas within the State. Inquiry about these bulletins, circulars, maps, and individually handled correspondence, should be addressed to the: State Geologist Missouri Geological Survey Rolla, Mo. FOOTNOTES [1]This service is also offered by the Department of Geology, Missouri School of Mines and Metallurgy, Rolla, Missouri, and by the State Geologist, Rolla, Missouri. INDEX A Acid, testing, muriatic, hydrochloric, storage battery, sulphuric 10 Agate 37 Alabaster gypsum 63 Aluminum 23 Amethyst 42 Aragonite 17 Arrow heads 34, 71, 72 Artifacts 71, 72 Asphaltic sandstone 32 Audrain County 26 B Barite 19, 61, 74 Barton County 32 Basalt 13, 44, 46, 47, 48, 71, 73 Bauxite 23, 29 Biotite mica 44, 54 Black jack zinc ore 60 Bloodstone 42 Blossom rock 42 Boone County 26 Brick 22, 74 Burley clay 29, 66, 73 Burlington limestone 12 Burned shale 21, 54