Books by R. Z. Virgin:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Virgin, R. Z. (Robert Zerubabel): Mine management; a practical handbook for use in vocational schools, mining colleges and universities, also for use of fire-bosses, mine foreman, superintendents and others who aspire to become managers (D. Van Nostrand Company, 1922) (page images at HathiTrust)
Find more by R. Z. Virgin at your library, or elsewhere.