TY  - BOOK
AU  -  Hoffmann,B.
TI  -  Calving problems and early viability of the calf : :  a seminar / 
PY  - 1979///
CY  -  The Hague : 
PB  -  Martinus Nijhoff Publishers, 
KW  -  Cattle
KW  -  Parturition
KW  -  Calves
ER  -