Up for bid are 5 U.S. Department of Commerce, Bureau of Mines Bulletins. Very Good Condition. The bulletins are:
Bulletin 305 - INSPECTION AND TESTING OF MINE-TYPE ELECTRICAL EQUIPMENT FOR PERMISSIB8ILTY - Softcover. 26 Pages. (1929)
Bulletin 307 - FLOW OF GASES THROUGH BEDS OF BROKEN SOLIDS - By C.C. Furnas. Softcover. 144 Pages. (1929).
Bulletin 308 - OXIDES IN PIG IRON: THEIR ORIGIN AND ACTION IN THE STEEL-MAKING PROCESS - By C.H. Herty, Jr. and J.M. Gaines, Jr. Softcover. 56 Pages. (1929).
Bulletin 312 - BAUXITE FLOAT-AND-SINK FRACTIONATIONS AND FLOATION EXPERIMENTS - By B.W. Gandrud and Fred D. De Vaney. Softcover. 101 Pages. (1929).
Bulletin 313 - PERMISSIBLE STORAGE-BATTERY LOCOMOTIVES AND POWER TRUCKS - By L.C. Ilsley, E. J. Gleim, and H.B. Brunot. Softcover. 120 Pages. (1929).

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