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Niles, Donald E. (ed.) / The Wisconsin engineer
Volume 48, Number 3 (November 1943)
Benson, C. Gordon
[Mining and metallurgical engineering or how to earn $400 per month], pp. [18]-[21]
Page [18]
![[page image]](https://images.library.wisc.edu/UW/EFacs/WIEngr/WIEv48no3/L/0020.jpg)
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