Coal-mine timbering
Subtitle: November, 1919
Series: [U.S.] Federal Board for Vocational Education. Bulletin -- no. 40; Trade and industrial series -- no. 10; Bulletin -- no. 40.; Trade and industrial series -- no. 10.
Publisher: Federal Board for Vocational Education
Published: 1920
Place of publication: Washington, D.C
Language: eng
Number of pages: 103
Subjects: Mine timbering
Notes: Prepared by Mr. R.Z. Virgin. cf. p. 7.