Show NEW publications BUREAU OF MINES list 35 april 1915 bulletins bulletin 81 the smelting smelling sm elting of copper ores in the electric furnace by D A lyon and R M keeney 1915 77 pp ap bulletin 87 houses for mining towns by J H white 1915 64 pp ap 8 pis 9 figs bulletin 90 abstracts of current decisions on mines and minin december 1913 to september 1914 by J W thompson 1915 pp ap technical papers technical paper 89 coal tar products and the possibility of increasing their manufacture in the united states by H A porter with a chapter on coal tar products used in explosives by C G storm 1915 21 pp ap technical paper 90 metallurgical problems in the treatment of the low grade complex ores of utah by R H bradford and D A lyon 1915 40 pp ap technical paper 99 effect of the european war on the ceramic industries of the united states by A S watts 1915 15 pp ap note only a limited supply of these publications is available for free distribution and applicants are asked to operate cooperate co in insuring an equitable distribution by selecting publications that are of especial espe cial interest requests for all papers can not be granted without satisfactory reason publications should be ordered by number and title applications should be addressed to the director of the bureau of mines washington D C |