Vintage postcard depicting the Crater of Mud Volcano in Yellowstone National Park, featuring a colorized image of visitors on a boardwalk overlooking the steaming geothermal feature. The reverse side includes historical information about the site's eruptions and the Haynes Picture Shops copyright.

Specifications:
• Condition: VG+
• Subject: Crater of Mud Volcano, Yellowstone Park
• Photographer: Haynes
• Type: Divided Back Postcard
• Era: White Border (c. 1915-1930)
• Publisher: Haynes Picture Shops, Inc.

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Keywords: national parks, wyoming, geothermal, ephemera, souvenir, travel, geology, collectible, antique, landscape

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