Dutch elm disease and its control
Whitten, R.R., Swingle, R.U.
Dutch elm disease and its control - Washington 1964 - 0.5 - No. 193; United States Departm .
632:634.972.8
Dutch elm disease and its control - Washington 1964 - 0.5 - No. 193; United States Departm .
632:634.972.8