[24.] “Gasoline and Alcohol Tests,” by R. M. Strong, Bulletin No. 392, U. S. Geological Survey, 1909.
[25.] “Washing and Coking Tests,” by Richard Moldenke, A. W. Belden and G. R. Delamater, Bulletin No. 336, U. S. Geological Survey, 1908; also, “Washing and Coking Tests at Denver, Colo.,” by A. W. Belden and G. R. Delamater, Bulletin No. 368, U. S. Geological Survey, 1909.
[26.] U. S. Geological Survey, Professional Paper No. 48, Pt. III, and Bulletins Nos. 290, 332, 336, 368, 385, and 403.
[27.] Professional Paper No. 48, and Bulletins Nos. 290, 316, 332, 343, 363, 366, 385, 402, 403, and 412, U. S. Geological Survey.
[28.] “Peat Deposits of Maine,” by E. D. Bastin and C. A. Davis. Bulletin No. 376, U. S. Geological Survey, 1909.
[29.] U. S. Geological Survey, Pittsburg, Pa.
[30.] Chief Explosives Chemist, U. S. Geological Survey.
[31.] Lieutenant-Colonel, Ordnance Dept., U. S. A.