http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Tyonek (C-1) SE quadrangle, Alaska--Matanuska--Susitna Borough, 1979
produced by the United States Geological Survey.
Relief shown by contours and spot heights.
"Compiled from aerial photographs taken 1972; revisions shown in purple and woodland compiled from aerial photographs taken 1988 ... map edited 1993."