2026-04-07T19:45:07Z

Mine ventilation.

Call Number:

P19469

Date:

1939

Description:

Serial issue. Issued as: United States. Bureau of Mines. Information circular, 7047 (1939:Jan.).

Subject Topical:

Mine ventilation., Mine dusts., Air--Purification.

All:

Mine ventilation., Air--Purification., Mine dusts.