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	1.	Contributions to the study of coal: A proposed simplification of the Parr unit coal formula, by Gilbert Thiessen. Ash-to-mineral matter correction in coal analyses, by Gilbert Thiessen. Unit coal as a basis of coal standardization as applied to Illinois coals, by G. H. Cady and O. W. Rees. Studies of the graphical method of calculating pure coal calorific value, by Gilbert Thiessen and Frank H. Reed. by Illinois State Geological Survey Thiessen, Gilbert, 1905- Cady, Gilbert H. (Gilbert Haven), 1882- Rees, Orin Wainwright, 1898- Reed, Frank Hynes, 1890- Series: Illinois State Geological Survey. Report of investigations ; no. 32. Material type: Text; Format: print ; Literary form: Not fiction Publication details: Urbana, Illinois, Printed by authority of the state of Illinois, 1934 Availability: No items available. Add to cart (remove)
	2.	Effect of preparation on ash fusibility of selected Illinois coals, by L. C. McCabe and O. W. Rees. by McCabe, Louis Cordell, 1904- Rees, Orin Wainwright, 1898- [joint author.] Material type: Text; Format: print ; Literary form: Not fiction Publication details: Urbana, Illinois, printed by authority of the state of Illinois, 1939 Availability: No items available. Add to cart (remove)
	3.	A study of the equilibration method of determining moisture in coal for classification by rank, by O.W. Rees, F.H. Reed, and G.W. Land ... by Rees, Orin Wainwright, 1898- Reed, Frank Hynes, 1890- [joint author.] Land, George William [joint author.] Series: Illinois State Geological Survey. Report of investigations ; no. 58 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Urbana, Ill., Printed by authority of the state of Illinois, 1939 Availability: No items available. Add to cart (remove)
	4.	Moisture relations of banded ingredients in an Illinois coal, by O.W. Rees, G.W. Land, and F.H. Reed ... Printed by authority of the state of Illinois. by Rees, Orin Wainwright, 1898- Land, George William [joint author.] Reed, Frank Hynes, 1890- [joint author.] Series: Illinois State Geological Survey. Report of investigations ; no. 73 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Urbana, Ill., 1941 Availability: No items available. Add to cart (remove)
	5.	Determination of ash in coals unusually high in calcite and pyrite, by O.W. Rees and W.A. Selvig, in cooperation with United States Department of Interior, Bureau of Mines ... Printed by authority of the state of Illinois. by Rees, Orin Wainwright, 1898- Selvig, W. A. (Walter Alfred), 1886- United States. Bureau of Mines Series: Illinois. State geological survey. Report of investigations ; no. 81 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Urbana, Ill., 1942 Availability: No items available. Add to cart (remove)

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