http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
sampling procedures for spruce budworm egg-mass surveys (with reference to the Lake States)
Canada/United States Spruce Budworms Program
33 pages : illustrations (some color) ; 22 cm.
"CANUSA, Canada United States Spruce Budworms Program"--P. [2].
Agriculture handbook (United States. Department of Agriculture) ; no. 635