TY  - BOOK
AU  - Echols, Robert M.
TI  - Variation in Tracheid Length and Wood Density in Geograpic Races of Scotch Pine
U1  - 674.144 21st ed.
PY  - 1958///
CY  - New Haven 
PB  - Yale University
KW  - Wood Density Measurment, Statistical Design
N1  - Yale University: School of Forestry 
Bulletin no.64
ER  -