Owen R A, Jagger D W, Quan-Taylor R
Clinigau Ceffylau Fyrnwy, Bron Fyrnwy, Powys.
Vet Rec. 1988 Nov 26;123(22):562-3. doi: 10.1136/vr.123.22.562.
The prevalence of Anoplocephala perfoliata in 103 horses and ponies from Clwyd, Powys and the adjacent English marches, slaughtered during January 1987, was 69 per cent.