Duncan Mountain
Summit in Franklin County, New York · on the USGS Alder Brook quadrangle
44.52293, -73.92423
Maps that show Duncan Mountain
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Alder Brook, NY
Detailed map of terrain, trails and roads
USGS topo, 2023
Lyon Mountain, NY
Old map for history, not navigation
USGS historical 15-minute topo (1911)
Lyon Mountain, NY
Old map for history, not navigation
USGS historical 15-minute topo (1913)
Lyon Mountain, NY
Old map for history, not navigation
USGS historical 15-minute topo (1931)
Bureau of Land Management Eastern States Overview map
BLM Eastern States (2019)
IFR Enroute Low Altitude Chart L-32 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-11 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-10 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-12 (U.S.)
FAA, 2026-10-29
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).