000 00299 am a2200121 a 4500
100 1 _aBullock, D.S.
245 1 _aPurebred bulls pay
260 _aWisconsin
_c1920
300 _a1-16 p.
942 _2udc
_cB
440 _aWisconsin Agricultural Extension Service. Circular No. 121
901 _aS50714
999 _c107969
_d107969