Smith, Richard H. - Economic Research Service, Department of Agriculture - 1977
The xylem resin of more than 5,700 Pinus ponderosa Laws. trees at 68 locations in Western United States was analyzed in a 9-year study. The quantity of the five major components-a-pinene, ,8-pinene, 3-carene, myrene, limonene-of the monoterpene portion of individual trees varied widely over the...