Lewis and Clark Expedition was produced by the National Park Service's National Register of Historic Places, Jefferson National Expansion Memorial, and Lewis and Clark National Historic Trail, in conjunction with the National Conference of State Historic Preservation Officers (NCSHPO). It was created under the direction of Carol D. Shull, Keeper of the National Register of Historic Places, National Park Service, Patrick Andrus, Heritage Tourism Manager, and Beth L. Savage, Publications Managing Editor. Lewis and Clark Expedition is based on information in the files of the National Register of Historic Places and National Historic Landmarks collections. These materials are kept at 1201 Eye St., NW, Washington, D.C., and are open to the public from 8:00am to 12:00pm and 1:00pm to 4:00pm, Monday through Friday (although the collection is currently closed, click here for more information).

Bob Moore from the Jefferson National Expansion Memorial and Laurie Heupel from the Lewis and Clark National Historic Trail provided invaluable photographic and editorial assistance. National Register web production team members included Jeff Joeckel, who designed the itinerary, Rustin Quaide, and Shannon Bell (all of NCSHPO). Property descriptions were written by Kristin Sanders, (National Council for Preservation Education intern), Mike Chin (also from NCPE) and Rustin Quaide. Essays entitled Early Explorations and The Trail Today were written by Rustin Quaide; the other four essays were excerpted by Shannon Bell from material written by Bob Moore for the Lewis and Clark Journey of Discovery portion of the Jefferson National Expansion Memorial website. Special thanks to the following for their photographic contributions: American Philosophical Society, Beaverhead-Deerlodge National Forest, Bureau of Land Management, Discovering Lewis and Clark (www.lewis-clark.org), Friends of Arrow Rock, Friends of Fort Atkinson, Illinois State Historic Preservation Agency, Larry Grantham of the Missouri Department of Historic Resources, Missouri Historical Society, Nebraska State Historical Society, Oregon Historical Society, Oregon Tourism Commission, Pebble Publishing (www.rocheport.com), Sioux City Public Museum, State Historical Society of North Dakota, Travel Montana, Traveler's Rest Preservation and Heritage Association, and artists Ron Backer and Gary Lucy.

Images used in the design of the Lewis and Clark Expedition homepage are courtesy of Discovering Lewis and Clark (www.lewis-clark.org) [boat image: Researched and built by Richard C. Boss for Fort Clatsop National Memorial; now on loan to the Lewis and Clark Interpretive Center, Great Falls, Montana], Ed Hamilton [Portrait of York: Photo by Ed Hamilton of clay study for 8 foot bronze York Memorial to be installed in the spring of 2003 on the Belvedere Plaza in downtown Louisville overlooking the Ohio River commissioned by the City of Louisville, Kentucky, Mayor David Armstrong 2002], and Scott Christensen [St. Louis Arch].