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[1] Name on the Register [2] Image Date listed [3] Location Description
29 Variable Density Tunnel
Variable Density Tunnel
Variable Density Tunnel
October 3, 1985
( #85002795)
Langley Research Center
37°04′43″N 76°20′39″W / 37.078611°N 76.344167°W / 37.078611; -76.344167 (Variable Density Tunnel)
  1. ^ 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.
  2. ^ "National Register Information System". National Register of Historic Places. National Park Service. April 24, 2008.
  3. ^ 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.