Coal-mine gases
Subtitle: technical information for use in vocationa training classes
Contributors: Callen, Alfred C. (Alfred Copeland), 1888-1951; United States. Bureau of Mines
Edition: Rev. ed., 1931. Issued by the Federal board for vocational education, Washington, D.C.
Series: Bulletin -- no. 39. -- Trade and industrial series -- no. 9; Bulletin -- no. 39.
Publisher: [U.S. Govt., print. off.]
Published: 1931
Place of publication: Washington]
Language: eng
Number of pages: 41
Subjects: Gases
Notes: First edition published in 1919, prepared by A.C. Callen. Revised with the cooperation of the United States Bureau of mines. cf. Foreword.

"References for further study": p. 38-39.

"Publications of the Federal board for vocational education relating to trade and industrial education": p. 40-41.