Coal-mine gases
Contributors: United States. Federal Board for Vocational Education
Series: Bulletin / Federal Board for Vocational Education -- no. 39; Trade and industrial series -- no. 9; Bulletin -- no. 39.; Trade and industrial series -- no. 9.
Publisher: Issued by the Federal Board for Vocational Education; U.S. G.P.O.
Published: 1920
Place of publication: Washington, D.C
Language: eng
Number of pages: 36
Subjects: Mine gases; Study and teaching
Notes: "October, 1919."

"Originally prepared for use in the mining extension classes of the state of West Virginia by Mr. A.C. Callen"--Foreword.