12 INSECTS INJURIOUS TO FOEESTS. 
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. S. 
Dept. Agr. for 1905, Extract No. 395. 
1907. Crawford, C. G. — The open-tank method for the treatment of timber. 
<Cir. 101, Forest Service, U. S. Dept. Agr. 
1907. Crawford, C. G. — Brush and tank pole treatments. <Cir. 104, Forest Serv- 
ice, U. S. Dept. Agr. 
1907. Grinnell, H. — Seasoning of telephone and telegraph poles. <Cir. 103, Forest 
Service, U. S. 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. S. Dept, Agr. 
1909. Sherfesee, W. F. — Wood preservation in the United States. <Bul. 78, Forest 
Service, U. S. Dept. Agr., pp. 24, 25, Table I. 
1909. Sherfesee and Weiss. — Wood preservation. <Rep. Natl. Conserv. Com., 
vol. 2, p. 663. 
1909. Kellogg, R. S.— The timber supply of the United States. <Cir. 166, Forest 
Service, U. S. Dept. Agr., pp. 20-21. 
1910. Willis, C. P. — The preservative treatment of farm timbers. < Farmers' Bui. 
387, U. S. Dept, Agr. 
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