H. J. Hopen

• Controlling weeds in the home garden
• Herbicide guide for commercial vegetable growers, 1965
• Herbicide guide for commercial vegetable growers, 1972
• Herbicide guide for commercial vegetable growers, 1976
• Herbicide guide for commercial vegetable growers, 1977
• Herbicide guide for commercial vegetable growers, 1978
• Herbicide guide for commercial vegetable growers, 1979
• Herbicide guide for commercial vegetable growers, 1980
• Herbicide guide for commercial vegetable growers, 1981
• Seeding rates, cultivars, and planting methods for small processing onions (Alium cepa L.)
• Vegetable minigardens
• Weed management guide for commercial vegetable growers, 1982