From Introduction: "This paper gives the results of sampling the gases from blasting drift rounds at five mines-the United Verde Extension, Calumet & Arizona, Old Dominion, Mountain Copper, and the United Verde-and of tunnel rounds at the Big Creek water tunnel and Moffat railroad tunnel. The paper also describes the rounds blasted and the methods of sampling and analyzing the gases. In all, 99 rounds were fired and 376 samples were taken."

From Introduction: "The drilling and blasting practices described in this bulletin are chiefly those in use at the time of these visits. Information, obtained by correspondence, on recent changes at certain mines is also included. The bulletin is confined to descriptions and comparisons of drilling and blasting methods at the six open-cut mines."

Report discussing the technology for mining silica and the various uses of silica in industry and the arts.

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.

Report compiled by the U.S. Bureau of Mines including statistics on fatalities in coal mines located in the United States as well as data regarding the various operations (e.g., number of miners employed and average production). The information is organized into tables for comparison and the text draws some overall conclusions in the summary.

Volume provides abstracts of agricultural experiments conducted during the year. Also includes statistics, convention reports, bulletins, bibliographies and listings for Spanish edition publications from the Porto Rico Station. Name and subject indexes start on page 901.

Volume provides abstracts of agricultural experiments conducted during the year. Also includes statistics, convention reports, bulletins, and bibliographies. Name and subject indexes start on page 901.

Volume provides abstracts of agricultural experiments conducted during the year. Also includes statistics, convention reports, bulletins, bibliographies and listings for Spanish edition publications from the Porto Rico Station. Name and subject indexes start on page 901.

This volume of the Journal contains the full documentation for the first called session of the Senate of Texas including proceedings, authors of Senate bills, as well as the history of Senate bills and resolutions. The index begins on page 541.

The Journal contains the proceedings of the Senate of Texas including legislation, reports, discussions, votes, and points-of-order. Some volumes also contain supplementary materials. The index begins on page 1409.

The Journal contains the proceedings of the House of Representatives of Texas including legislation, reports, discussions, votes, and points-of-order. Some volumes also contain supplementary materials. The index begins on page 1635.

General index listing persons, naval units, ships, battles, and major subject headings mentioned in the "Official Records of the Union and Confederate Navies in the War of the Rebellion" volumes. Listings include the numbers for the series (Roman numerals) and volume (Arabic numbers) where the reference(s) can be found.

Report includes the National Advisory Committee for Aeronautics letter of submittal to the president, congressional report, summaries of the committee's activities and research accomplished, bibliographies, and financial report.

Annual report submitted by the Boy Scouts of America to Congress describing highlights from 1926, activities, ideals, finance, organizational leadership, and other information about scouting programs.

From Scope of Bulletin: "This bulletin gives the results of a study of present conditions in Alaska placer mining, including the methods employed and the costs, and will be helpful to placer miners, engineers, and all others interested in the industry."