Some of the principal insect enemies of coniferous forests in the United States.
Hopkins, A. D. 1857-1948.
Some of the principal insect enemies of coniferous forests in the United States. - Washington, 1903. - p. 265-282. illus., pl. xxviii-xxix. 23 cm.
In: United States, Dept of agriculture. Yearbook, 1902, p. 265-282. illus., pl. xxviii-xxix. 23 cm. Washington, 1903.
agr07000944
Forest insects.
SB761 / .H8
Some of the principal insect enemies of coniferous forests in the United States. - Washington, 1903. - p. 265-282. illus., pl. xxviii-xxix. 23 cm.
In: United States, Dept of agriculture. Yearbook, 1902, p. 265-282. illus., pl. xxviii-xxix. 23 cm. Washington, 1903.
agr07000944
Forest insects.
SB761 / .H8