TY  - BK
AU  - Critchfield,W.B.
AU  - Little,E.L.Jr
TI  - Geographic distribution of the pines of the world
T2  - Miscellaneous Publication
U1  - 585.2 
PY  - 1971///
CY  - Washington, DC (USA)
PB  - USDA, 
ER  -