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Physiographic Provinces - Geology (U.S. National Park Service)
Physiographic province - Wikipedia
Physiographic regions of the United States - Wikipedia
16.2: Physiograhic Provinces of the United States of America
Physiographic region - Wikipedia
Series: Physiographic Provinces - U.S. National Park Service
Basin and Range Province - U.S. National Park Service
Physiographic Provinces | Overview, Features & Factors
14: Physiographic Provinces - Geosciences LibreTexts
Ridge and Valley | Appalachians, Map, & Facts | Britannica