|Nearest city||Portland, Missouri|
|NRHP Reference #||66000415|
|Added to NRHP||October 15, 1966|
|Designated NHL||July 19, 1964|
Research Cave is a Native American archeological site near Portland, Missouri. Locally known as "Arnold-Research Cave" or "Saltpetre Cave", the cave is located in an outcrop of sandstone approximately 2 miles (3.2 km) north of Portland.:2 it was occupied intermittently for over 8,000 years. It has been recommended for de-designation as a National Historic Landmark due to looting.
- "National Register Information System". National Register of Historic Places. National Park Service. 2008-04-15.
- "Research Cave". National Historic Landmark summary listing. National Park Service. Retrieved 2008-06-17.
- Shippee, J.M. "The Archaeology of Arnold-Research Cave Callaway County, Missouri". Missouri Archaeologist 28 (1966).
|This article about a property in Missouri on the National Register of Historic Places is a stub. You can help Wikipedia by expanding it.|