TY  - BOOK
AU  - GERHOLD, H D
TI  - Breding pest resistant trees: Proceeding of a NATO and NSF studty institute on genetic improvement for disease and insect resistance  of forest trees heldat Pennsilvanya. 1964
U1  - 575:631.52:632.7 
PY  - 1966///
CY  - London
PB  - Pergamon
KW  - Pest resistance forest trees
ER  -