000 00346nam a2200109Ia 4500
100 _aProgrammed learning
942 _cBK
245 _aProgrammed learning course on Hepatitis B surface antigen (HB Ag) and Antibody to hepatitis b surface antigen ( anti-HB)
260 _aLaboratories, North Chicago
_c1976
082 _a616.3623 Pro
300 _a31
999 _c20413
_d20413