Oliver R. (Oliver Rivington) Willis

• Catalogue of Plants Growing Without Cultivation in the State of New Jersey, with a Specific Description of All the Species of Violet Found Therein. Directions for Collecting ... Also, a Directory of Living Botanists of North America and the West Indies
• Catalogue of Plants Growing Without Cultivation in the State of New Jersey, with a Specific Description of All the Species of Violet Found Therein. Directions for Collecting ... to Which Is Added a Directory of Living Botanists of North America and The...