air flow at discharge of fan-pipe lines in mines; part 1.-- 10 inch line in development end. Bureau of Mines report of investigations #3531
McElroy, G.E.
Wash:: USGPO, 1940.. 14pp Very good (Item ID: 17095)
$5.00
Wash:: USGPO, 1940.. 14pp Very good (Item ID: 17095)
$5.00