Books by C. Ropp:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Ropp, C. (Christian): Ropp's commercial calculator : a practical arithmetic for practical purposes, containing a complete system of useful, accurate & convenient tables and simple, short and practical methods for rapid calculation (s.n.], 1887) (page images at HathiTrust)- Ropp, C. (Christian): Ropp's easy calculator, designed for the use of farmers, mechanics, business men and laborers. Containing many convenient and valuable tables showing the value of wheat, corn, rye, oats, barley, cattle, hogs, hay, coal, lumber, merchandise; the simple and compound interest at 6, 7, 8 and 10 per cent.; measurement of boards, scantlings, timbers, saw logs, cisterns, tanks, granaries, corncribs, wagon-beds; time table, wages tables, etc. Also entirely new and practical methods of rapid calculation (Bloomington, Ill., 1880) (page images at HathiTrust)
- Ropp, C. (Christian): Ropp's easy calculator designed for the use of the farmers, mechanics, business men and laborers . . . ([s.n.], 1879) (page images at HathiTrust)
- Ropp, C. (Christian): Ropp's new calculator and short-cut arithmetic, containing an original and comprehensive system of useful, convenient and labor-saving tables, also the essence of arithmetic and mensuration, condensed and simplified ... (C. Ropp & sons, 1903) (page images at HathiTrust)
- Ropp, C. (Christian): Ropp's new commercial calculator and short-cut arithmetic, containing a new, complete and comprehensive system of useful, convenient and labor-saving tables, also the essence of arithmetic and mensuration, condensed and simplified. (C. Ropp & Sons, 1906) (page images at HathiTrust)
Find more by C. Ropp at your library, or elsewhere.