00335nam a2200121 a 450000500170000002000150001708200190003210000060005111000760005724500170013326000440015030000190019420251203091704.0  a0309040345  a634.9,bD, mgg  d_  aComittee on managing global genetic resources: agricultural imperatives  aForest trees  aWasingtonbNational Academy Pressc1991  axvi,230p, 22cm