Nematode parasite population in sheep and on pasture CROFTON, H.D. text England Commonwealth Agricultural Bureaux 1971 en 104 p.: ill.; 25 cm. CROFTON, H.D. SHEEP -- NEMATODA -- HELMINTHOLOGY 616.995.1/CRO/n 240221 20240221083526 INLIS000000000008374 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)