Show RECENT publications the united states bureau of mines has recently issued the following publications bulletin 53 mining and treatment of feldspar and kaolin in the southern appalachian region by A S watts 1913 pp ap 16 pis 12 figs bulletin 64 the iron ores in the united states their composition and economic value by J T jr 1913 pp ap 16 pis 3 figs technical paper 33 sanitation at mining villages in the birmingham district ala by D E woodbridge 1913 27 pp ap I 1 pl 9 figs technical paper 43 the influence of inert gases on inflammable gaseous mixtures by J K clement 1913 24 pp ap I 1 pi 8 figs technical paper 55 the production and use of brown coal in the vicinity of cologne germany by C A davis 1913 15 PP |