00902cam a22002651a 4500001001300000003000400013005001700017008004100034010001700075035002000092040001800112042001200130050002400142100003800166245002700204260009200231300004900323490006400372490004200436500001700478500003700495500002200532650002200554710006000576e  20000544 DLC20260227111211.0890405s1920    dcuaf        f000 0 eng    ae  20000544   a(OCoLC)19497253  aDLCcWvUdDLC  apremarc00aLC1045b.A25 no. 411 aVirgin, R. Z.q(Robert Zerubabel)10aCoal-mine ventilation.  aWashington, D.C. :bFederal Board for Vocational Education :bGovt. Print. Off.,c1920.  a63 p., [3] leaves of plates :bill ;c24 cm.0 aBulletin / Federal Board for Vocational Education ;vno. 410 aTrade and industrial series ;vno. 11  aCover title.  a"Prepared by R.Z. Virgin"--P. 5.  a"November, 1919." 0aMine ventilation.1 aUnited States.bFederal Board for Vocational Education.