Разширено търсене
Автор да съдържа Oddvar Helle
А 1015
Каталог "Книги"
Gastrointestinal parasites in sheep on lowland pastures in eastern Norway
(1971)
Oddvar Helle
А 1015
Каталог "Книги"
The effect on sheep parasites of grazing in alternate years by sheep and cattle
A comparsion with set-stocking, and the use of anthelmintics with these grazing managements
(1971)
Oddvar Helle
36940
Каталог "Книги"
Epidemiology of Gastrointestinal Parasite Infection of Sheep on Lowland Pastures in Norway
(1971)
Oddvar Helle