TY - BOOK ID - 138673263 TI - Meeting the vitamin D requirement of pigs with alfalfa hay and winter sunshine AU - Johnson, D.W. AU - Palmer, L.S. PY - 1941 PB - S.l. U. S. Government Printing Office DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:138673263 AB - ER -