Regulations concerning oil shale leases
Subtitle: Authorized by act of February 25, 1920 (Public no. 146) : approved March 11, 1920 (Reprint as amended March 27, 1920)
Series: Circular -- no. 671
Publisher: U.S. G.P.O.
Published: 1920
Place of publication: Washington
Language: eng
Number of pages: 15
Subjects: Oil-shale industry