The majority of Hilgardia articles have been grouped into at least one of the following collections:
- Animal, Aquaculture and Veterinary Science
- Botany and Plant Science
- Ecology and Rangeland
- Economics and Public Policy
- Entomology
- Forestry
- Nutrition, Food Science and Food Safety
- Plant Pathology
- Soil, Air and Water Science
- Wildlife
- Wine and Grape
Browse a collection by clicking on one of the links above.