Jefferson National Parks Association (JNPA) is a federally recognized National Park Service cooperating association.  It has a cooperative agreement with the U.S. Army Corps of Engineers to operate a bookstore at the Lewis and Clark Visitor Center. As a private non-profit organization, JNPA supports the educational programs offered by both the National Park Service and the Corps of Engineers.

JNPA does not accept mail order sales at the Lewis and Clark Visitor Center.