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- A hydroelectric power plant equipment history project.
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- PAGE 1. PUBLISHED AND PRINTED IN 1888 BY THE JAMES LEFFEL & COMPANY.
- THE MECHANICAL NEWS
- THE MECHANICAL NEWS ADVERTISEMENTS FOR 1893.
- The Mechanical News, an illustrated journal of. v23 no 9. Circa 1893.
- 1893 advertisement for the James Leffel & Company.
- The Mechanical News magazine history.
- THE MECHANICAL NEWS FROM MARCH 1886.
- THE MECHANICAL NEWS FROM MARCH 1886. PAGE 2.
- THE MECHANICAL NEWS FROM MARCH 1886. PAGE 3.
- THE MECHANICAL NEWS FROM APRIL 1886. PAGE 1.