Bulletin issued by the U.S. Bureau of Mines: "This publication is devoted exclusively to a review and abstracts of decisions based on the laws governing the rights and duties of mine owners, operators, miners, and persons trafficking in all kinds of mining properties. It includes abstracts of current decisions of all the Federal and State courts of last resort on questions relating to the mining industries" (Bulletin 61, p. 9).

Report issued by the Bureau of Mines over studies conducted on the production and uses of silica. Forms and different uses for silica are discussed. This report includes tables, illustrations, and photographs.

From Introduction: "This bulletin is the third of the series of yearly petroleum bibliographies being published by the Bureau of Mines."

Report issued by the Bureau of Mines over talc and soapstone. The different mining methods, as well as their uses are discussed. This report includes tables, illustrations, and photographs.

From Introduction: "This bulletin is the fourth in the series of petroleum bibliographies being published by the Bureau of Mines, the preceding, Bulletins 149, 165, and 180, being complications for the years 1915, 1916, and 1917, respectively. In this bulletin the same general plan has been followed in arranging the references, but a few changes and additions have been made in classification, the more important changes being in the classes "Geology and Origin" and "Refining and Refineries." During the year German periodicals were not available, and as in the bibliography for 1917, references to articles in foreign journals that were not available have been taken from other sources and credit given to those sources."

Report issued by the Bureau of Mines consisting of bibliographies for petroleum bulletins. The bibliographies for bulletins published between 1919 and 1920 are presented.