1. An extension program in a changing agriculture;Ahlgren;J. Dairy Sci.,1962
2. Dairy herd improvement letter;Sci. Educ. Admin., US Dep. Agric.,1979
3. Market profile;Dairy Herd Manage,1979
4. Evaluation of economic and social consequences of cooperative extension programs;Sci. Educ. Admin., US Dep. Agric.,1980
5. Dairy cattle: principles, practices, problems, profits;Bath,1978