00469nam a2200157Ia 4500001001000000003000500010008004100015010001100056040000900067100001600076245006700092260004000159300000900199500007500208650002800283Para_7167CHAP220125s1949    xx            000 0 und d  a206053  cCHAP  aWelch, D.S.  aThe cause and treatment of cavities in trees /c by D.S. Welch  aIthaca, N.Y. :b Cornell University  a6 p.  aSobretiro de: Proccedings of 25th National Shade Tree Conference, 1949  aArboles x enfermedades