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Juglans - Wikipedia
Juglans regia - Wikipedia
Juglans nigra - Wikipedia
Juglans nigra (Black Walnut) - Gardenia
Juglans regia - Plant Finder - Missouri Botanical Garden
How to Grow and Care for English Walnut - The Spruce
Walnut | Tree, Nut, Species, Uses, & Facts | Britannica
Juglans regia - North Carolina Extension Gardener Plant Toolbox
Juglans regia L. | Plants of the World Online | Kew Science
Juglans nigra - Plant Finder - Missouri Botanical Garden