000 00283nam a2200109 4500
245 _aIntroduction to viruses
_cGeorge Usher
100 _aUsher, George
260 _aOxford
_bPergaman Press.
_c1970
300 _a33p.;18cm.
490 _aSelected topics in biology
082 _a576.64
_bUSH
999 _c18510
_d18510