NavDat references for: Inside a drawn polygon (4 points)
Search: https://www.navdat.org/results?poly=-105.556641+44.949249%3B-105.183105+43.309191%3B-102.392578+43.213183%3B-102.458496+45.182037

Bassett, William A (1961) Potassium-argon of Devils Tower, Wyoming. Science, vol.134, no.3487, pp.1373, 1961
DOI: 10.1126/science.134.3487.1373
GeoRef: 1961-010328
NavDat: https://www.navdat.org/reference?id=7430 (1 samples)

Kirchner, James Gary (1971)
GeoRef: 1972-001101
NavDat: https://www.navdat.org/reference?id=260 (5 samples)

McDowell, F W (1971) K-Ar ages of igneous rocks from the western United States. Isochron/West, no.2, pp.1-16, Aug 1971
GeoRef: Accession Number    1976-019966
NavDat: https://www.navdat.org/reference?id=322 (10 samples)

Armour, Michael D (1975)
GeoRef: 1977-025447
NavDat: https://www.navdat.org/reference?id=367 (75 samples)

Boyd, Thomas M (1975)
GeoRef: 1977-025450
NavDat: https://www.navdat.org/reference?id=368 (18 samples)

Olson, Kathleen Rae (1976)
GeoRef: 1976-900033
NavDat: https://www.navdat.org/reference?id=346 (8 samples)

Parkhill, Thomas A (1976)
GeoRef: 1989-040865
NavDat: https://www.navdat.org/reference?id=969 (8 samples)

Larsen, Richard K (1977)
GeoRef: 1980-012226
NavDat: https://www.navdat.org/reference?id=444 (17 samples)

Ray, John T (1979)
GeoRef: 1981-016940
NavDat: https://www.navdat.org/reference?id=534 (17 samples)

Fashbaugh, Earl F (1979)
GeoRef: 1981-016942
NavDat: https://www.navdat.org/reference?id=540 (5 samples)

Halvorson, Don Llewellyn (1980)
GeoRef: 1981-013663
NavDat: https://www.navdat.org/reference?id=531 (46 samples)

White, Stanley F (1980)
GeoRef: 1983-004024
NavDat: https://www.navdat.org/reference?id=609 (19 samples)

O'Toole, Frederick S (1981)
GeoRef: 1983-004021
NavDat: https://www.navdat.org/reference?id=608 (32 samples)

Wilkinson, Michael (1982)
GeoRef: 1982-067153
NavDat: https://www.navdat.org/reference?id=603 (23 samples)

Redden, Jack A; Obradovich, John D; Naeser, Charles W; Zartman, RobertE; Norton, James J (1983) Early Tertiary age of pitchstone in the northern Black Hills, SouthDakota. Science, vol.220, no.4602, pp.1153-1154, 10 Jun 1983
DOI: 10.1126/science.220.4602.1153
GeoRef: 1983-048809
NavDat: https://www.navdat.org/reference?id=635 (1 samples)

Staatz, M H (1983) U. S. Geological Survey Professional Paper, Report: P 1049-D, D1-D52    pp., 1983
GeoRef: 1983-052544
NavDat: https://www.navdat.org/reference?id=639 (33 samples)

Jenner, Gordon A, Jr (1984)
GeoRef: 1985-070367
NavDat: https://www.navdat.org/reference?id=754 (102 samples)

Duke, Genet I. Geochemistry and geochronology of Paleocene-Eocene alkalic igneous rocks, northern Black Hills, South Dakota and Wyoming.
GeoRef: 2005-900015
NavDat: https://www.navdat.org/reference?id=7720 (101 samples)