Coal-mine ventilation
Virgin, R. Z. (Robert Zerubabel)
creator
United States
Federal Board for Vocational Education.
text
dcu
Washington, D.C
Federal Board for Vocational Education
Govt. Print. Off.
1920
monographic
eng
63 p., [3] leaves of plates : ill ; 24 cm.
Cover title.
"Prepared by R.Z. Virgin"--P. 5.
"November, 1919."
Mine ventilation
LC1045 .A25 no. 41
Bulletin / Federal Board for Vocational Education ; no. 41
Trade and industrial series ; no. 11
e 20000544
DLC
890405
20260227111211.0
e 20000544