Safety factors in construction and ventilation
Subtitle: Wawona vehicular tunnerl, Yosemite national park, Calif.
By: by S.H. Ash.
Series: United States. Bureau of mines. Technical paper; 608
Publisher: U.S. Govt. Print. Off.
Published: 1940
Place of publication: Washington
Language: eng
Number of pages: 34
Subjects: Tunneling.; Tunnels -- Ventilation.; Wawona vehicular tunnel.
Other titles: Safety factors in Wawona vehicular tunnel, Calif.
Notes: At head of title: United States Dept. of the interior. Harold L. Ickes, secretary. Bureau of mines, John. W. Finch, director.
Running title: Safety factors in Wawona vehicular tunnel, Calif.