Coal-mine ventilation
Contributors: United States. Federal Board for Vocational Education.
Series: Bulletin / Federal Board for Vocational Education ;; no. 41; Trade and industrial series ;; no. 11
Publisher: Federal Board for Vocational Education; Govt. Print. Off.
Published: 1920
Place of publication: Washington, D.C
Language: eng
Number of pages: 63
Subjects: Mine ventilation.
Notes: Cover title.
"Prepared by R.Z. Virgin"--P. 5.
"November, 1919."