Supplemental list of respiratory protective devices approved by the Bureau of Mines :
additions to list published in Information Circular 7444 /
by L.B. Berger.
APA Citation
Berger, L. Bursley., United States. Bureau of Mines. (1949). Supplemental list of respiratory protective devices approved by the Bureau of Mines: additions to list published in Information Circular 7444. Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines.
MLA Citation
Berger, Lawrence Bursley, and United States. Bureau of Mines. Supplemental List of Respiratory Protective Devices Approved by the Bureau of Mines: Additions to List Published In Information Circular 7444. Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines, 1949.
Warning: These citations may not always be complete (especially for serials).