Books by Roy John Helfinstine:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Helfinstine, Roy John: Coke from medium-volatile and Illinois coals (Urbana, 1959), also by H. W. Jackman and Robert Louis Eissler (page images at HathiTrust)- Helfinstine, Roy John: Correlation of domestic stoker combustion with laboratory tests and types of fuels. II. Combustion tests and preparation studies of representative Illinois coals (Urbana, Ill., 1946), also by Charles C. Boley (page images at HathiTrust)
- Helfinstine, Roy John: Correlation of domestic stoker combustion with laboratory tests and types of fuels. III. Effect of coal size upon combustion characteristics (Urbana, Ill., 1948) (page images at HathiTrust)
- Helfinstine, Roy John: Correlation of domestic stoker combustion with laboratory tests and types of fuels. IV. Combustion tests of Illinois and other coals (Urbana, Ill., 1951) (page images at HathiTrust)
- Helfinstine, Roy John: The influence of coking time on expansion pressure and coke quality (Division of the Illinois State Geological Survey, 1958), also by H. W. Jackman and Robert Louis Eissler (page images at HathiTrust)
- Helfinstine, Roy John: Pelletizing Illinois fluorspar (Illinois State Geological Survey, 1963), also by H. W. Jackman and Josephus Thomas (page images at HathiTrust)
- Helfinstine, Roy John: Petroleum coke in Illinois coal blends for blast furnace coke (Urbana, 1960), also by H. W. Jackman and Robert Louis Eissler (page images at HathiTrust)
- Helfinstine, Roy John: Stockpiling Illinois coal for coke (Urbana, 1959), also by H. W. Jackman and Robert Louis Eissler (page images at HathiTrust)
- Helfinstine, Roy John: Sulfur reduction of Illinois coals : washability studies. Part 1. (State of Illinois, Dept. of Registration and Education, Illinois State Geological Survey, 1971) (page images at HathiTrust)
- Helfinstine, Roy John: Sulfur reduction of Illinois coals : washability studies. Part 2 (State of Illinois, Dept. of Registration and Education, Illinois State Geological Survey, 1974) (page images at HathiTrust)
- Helfinstine, Roy John: Sulfur varieties in Illinois coals : float-sink tests (Illinois State Geological Survey, 1969), also by Jack Aaron Simon, Neil F. Shimp, and Illinois State Geological Survey (page images at HathiTrust)
- Helfinstine, Roy John: Use of Illinois coal fines in production of metallurgical coke (Urbana, 1961), also by H. W. Jackman (page images at HathiTrust)
Find more by Roy John Helfinstine at your library, or elsewhere.