Jeffrey mine hand-book, number 505.
Publisher: Jeffrey manufacturing co.
Published: 1931
Place of publication: Columbus, O
Language: eng
Number of pages: 231
Subjects: Mining engineering -- Handbooks, manuals, etc.; Coal mines and mining.; Coal-mining machinery.
Genres: Handbooks, manuals, etc.
Notes: Running title: Jeffrey mining hand-book.
"Third edition."--Foreword.