TY  - BOOK
AU  - Shigo,Alex L.
ED  - United States.
TI  - Black walnut on Kansas strip mine Spols: some observation 25 years after pruning 
U1  - 631.542 
PY  - 1978///
CY  - Broomall
PB  - Forest Service
KW  - Pruning
KW  - Plant biotechnology
ER  -