Coal-Mine Ventilation Factors Page: I
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DEPARTMENT OF COMMERCE
WILLIAM F. WHITING, SECRETARY
BUREAU OF MINES
SCOTT TURNER, DRscToR
H. P. GREENWALD and G. E. McELROY
PRICE 25 CENTS
Sold only by the Superintendent of Documents, U. S. Government Printing Office
Washington, D. C.
GOVERNMENT PRINTING OFFICE
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Greenwald, H. P. & McElroy, G. E. Coal-Mine Ventilation Factors, report, 1929; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc12463/m1/1/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.