Billys Hill
Summit in Colusa County, California · on the USGS Glascock Mountain quadrangle
38.94900, -122.33861
Maps that show Billys Hill
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Glascock Mountain, CA — USGS 7.5-minute topo (2021)
USGS Topo Maps (public domain) · California
Public domain
Morgan Valley, CA — USGS historical 15-minute topo (1943)
USGS Historical Topo Maps (public domain) · California
Public domain
Morgan Valley, CA — USGS historical 15-minute topo (1944)
USGS Historical Topo Maps (public domain) · California
Public domain
Morgan Valley, CA — USGS historical 15-minute topo (1958)
USGS Historical Topo Maps (public domain) · California
Public domain
Indian Valley Wildlife Area — California CDFW
California CDFW Wildlife Area Maps · California
Public domain
IFR Enroute Low Altitude Chart L-02 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
IFR Enroute Low Altitude Chart L-03 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
IFR Enroute Low Altitude Chart L-11 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
IFR Enroute High Altitude Chart H-04 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
IFR Enroute High Altitude Chart H-03 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).