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Dune - Wikipedia
Sand dune | Definition, Formation, & Facts | Britannica
What is a Sand Dune? - Ocean Conservancy
Dune - Education | National Geographic Society
Geology - Great Sand Dunes National Park & Preserve (U.S.
How are sand dunes formed? - Internet Geography
What is a Sand Dune: Formation and Types of Sand Dunes
Geology of Great Sand Dunes National Park
Sand dunes - The Wildlife Trusts