Answer: SDAK
SDAK is a crossword puzzle answer that we have spotted 107 times.
Referring Clues:
- Mt. Rushmore site
 - Mount Rushmore's site: Abbr.
 - Neighbor of Minn.
 - Mt. Rushmore's state: Abbr.
 - Wounded Knee locale: Abbr.
 - Badlands Natl. Park locale
 - Pierre's state: Abbr.
 - Minn. neighbor
 - Mont. neighbor
 - Nebr. neighbor
 - Neb. neighbor
 - Wind Cave Natl. Park locale
 - Admission of 1889: Abbr.
 - Mount Rushmore locale: Abbr.
 - Badlands state: Abbr.
 - Badlands Natl. Park's state
 - Mt. Rushmore's place: Abbr.
 - Mount Rushmore's state: Abbr.
 - Where Wounded Knee is: Abbr.
 - Mt. Rushmore's locale: Abbr.
 - Home of Rapid City: Abbr.
 - Nebraska neighbor (abbr.)
 - Pierre's state (abbr.)
 - Mt. Rushmore's loc.
 - Badlands st.
 - Our 40th st.
 - Mount Rushmore's st.
 - Pierre's home (abbr.)
 - Where to see Mt. Rushmore
 - Mt. Rushmore's state
 - Mt. Rushmore's location
 - Tom Daschle's st.
 - Mount Rushmore's state (abbr.)
 - Mt. Rushmore's locale
 - Home of the Black Hills (abbr.)
 - It's nearly bisected by the Missouri R.
 - Mt. Rushmore locale
 - Tom Brokaw's birthplace (abbr.)
 - Its motto is "Under God, the people rule": Abbr.
 - Where to find Pierre: Abbr.
 - The Missouri R. forms part of its border
 - Home of Sioux Falls: Abbr.
 - Home to Wall Drug: Abbr.
 - The Big Sioux R. forms part of its border
 - "Under God the people rule" is its motto: Abbr.
 - Where T. Rex Sue was found
 - Wyo. neighbor
 - Cheyenne R. state
 - Wounded Knee's st.
 - Badlands Natl. Park site
 - Belle Fourche, in this state, is about 20 mi. south of the U.S.'s geographic center
 - Mt. Rushmore st.
 - Pierre's place (Abbr.)
 - Neighbor of Neb.
 - Coyote state, briefly
 - Pierre's place, briefly
 - Pierre's home: Abbr.
 - Wounded Knee's locale: Abbr.
 - Mt. Rushmore's place (abbr.)
 - Badlands locale: Abbr.
 - Black Hills loc.
 - Black Hills st.
 - Pierre is there: Abbr.
 - It's bisected by the Missouri R.
 - Only U.S. state in which the name of the state and its capital share no letters: Abbr.
 - Wind Cave Natl. Park setting
 - Its slogan is "Great Faces. Great Places.": Abbr.
 - Pierre's place: Abbr.
 - It's north of Neb.
 - Mt. Rushmore setting
 - Badlands locale (abbr.)
 - Pierre's st.
 - Rushmore's st.
 - Neighbor of Wyo. and Ia.
 - Its cap. is Pierre
 - Mt. Rushmore loc.
 - State west of Minn.
 - Its state sport is rodeo: Abbr.
 - Home to Ellsworth A.F.B.
 - Wind Cave Natl. Pk. setting
 - "Great Faces. Grace Places." st.
 - The 40th state (abbr.)
 - Where Mt. Rushmore is
 - Tom Brokaw's home st.
 - Home of Wind Cave Natl. Park
 - Mt. Rushmore's home: Abbr.
 - The Missouri R. runs through it
 - 40th st.
 - State north of Neb.
 - Its cap. is pronounced "peer"
 - Badlands location (abbr.)
 - Where I-90 and I-29 cross: Abbr.
 - 11-Down neighbor: Abbr.
 - Home to Pierre: Abbr.
 - Coyote st.
 - Crazy Horse Memorial loc.
 - Lake Oahe locale
 - Lake Oahe locale: Abbr.
 - The Missouri R. bisects it
 - Deadwood's state: Abbr.
 - Neighbor of Iowa: abbr.
 - Eastern neighbor of Wyoming: Abbr.
 - S. ___ (abbr. for Tom Brokaw's home state
 - St. with the second-smallest capital
 - Home of Mount Rushmore: Abbr.
 - State known for 60-ft.-high presidents' faces
 - The Coyote St.
 
Last Seen In:
- LA Times - August 26, 2022
 - Netword - July 26, 2020
 - LA Times - May 18, 2020
 - LA Times - March 01, 2020
 - New York Times - February 23, 2020
 - LA Times - July 21, 2019
 - LA Times - June 01, 2019
 - King Syndicate - Eugene Sheffer - September 27, 2018
 - LA Times - June 26, 2018
 - New York Times - April 10, 2018
 - Netword - March 18, 2018
 - LA Times - March 12, 2018
 - LA Times - November 08, 2017
 - LA Times - October 17, 2017
 - King Syndicate - Eugene Sheffer - August 14, 2017
 - LA Times - April 23, 2017
 - King Syndicate - Eugene Sheffer - January 02, 2017
 - LA Times - October 21, 2016
 - Netword - September 30, 2016
 - King Syndicate - Eugene Sheffer - September 23, 2016
 
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