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Ventilation of manholes.
Ventilation of manholes.
Ventilation of manholes.
Published Year
1930-1939 (2)
1940-1949 (1)
Subject
Manholes (3) *
Mine ventilation (2)
Air (1)
Manholes--Design and construction (1)
Manholes--Maintenance and repair (1)
Author
Jones, G. W. (3)
Miller, W. E. (3) *
Campbell, John. (2)
Yant, W. P. (2)
Campbell, John, (1)