12 INSECTS INJURIOUS TO FORESTS. 

PUBLICATIONS ON WOOD PRESERVATION AND STATISTICS ON 
POLES. 
1903. Von ScHRENK, H.—Seasoning of timber. <Bul. 41, Forest Service, U. S. 
Dept. Agr. 
1906. GRINNELL, H.—Prolonging the life of telephone poles. <Yearbook U. §. 
Dept. Agr. for 1905, Extract No. 395. 
1907. Crawrorp, ©. G.—The open-tank method for the treatment of timber. 
<Cir. 101, Forest Service, U. S. Dept. Agr. 
1907. Crawrorp, C. G.—Brush and tank pole treatments. <Cir. 104, Forest Sery- 
ice, U.S. Dept. Agr. 
1907. GRINNELL, H.—Seasoning of telephone and telegraph poles. <Cir. 103, Forest 
Service, U. 8. Dept. Agr. 
1908. SHERFESEE, W. F.—A primer of wood preservation. <Cir. 139, Forest Service, 
U.S. Dept. Agr. 
1908. Weiss, H. F.—Progress in chestnut pole preservation. <(Cir. 147, Forest 
Service, U. 8. Dept. Agr. 
1909. SHERFESEE, W. F.—Wood preservation in the United States. <Bul. 78, Forest 
Service, U. 8. Dept. Agr., pp. 24, 25, Table I. 
1909. SHERFESEE and Werss.—Wood preservation. <Rep. Natl. Conserv. Com., 
vol. 2, p. 663. 
1909. Kettoce, R. 8.—The timber supply of the United States. <Cir. 166, Forest 
Service, U.S. Dept. Agr., pp. 20-21. 
1910. Wiis, C. P.—The preservative treatment of farm timbers. <Farmers’ Bul. 
387, U. 8. Dept. Agr. 
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