Coal-mine ventilation.

By: Contributor(s): Material type: TextTextSeries: Bulletin / Federal Board for Vocational Education ; no. 41 | Trade and industrial series ; no. 11Publication details: Washington, D.C. : Federal Board for Vocational Education : Govt. Print. Off., 1920.Description: 63 p., [3] leaves of plates : ill ; 24 cmSubject(s): LOC classification:
  • LC1045 .A25 no. 41
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Cover title.

"Prepared by R.Z. Virgin"--P. 5.

"November, 1919."

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