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Numbers represent an alphabetical ordering by significant words. Various colorings, defined here, differentiate National Historic Landmarks and historic districts from other NRHP buildings, structures, sites or objects.
The eight-digit number below each date is the number assigned to each location in the National Register Information System database, which can be viewed by clicking the number.
The NRIS lists the Spring Creek site as "address restricted", but various references (H. R. Crane; James B. Griffin (1968), "UNIVERSITY OF MICHIGAN RADIOCARBON DATES XII", Radiocarbon, 10: 61–114) give the approximate location in Egelston Township. The geo-coordinates are approximate.
Location derived from this Clipper-associated website; the NRIS still lists it in its old location of Hammond, Indiana
