Challis 1957/1973
PDF (30.1 MB)
USGS - Historic Quads
Challis 1957/1969
PDF (26.3 MB)
Challis 1957/1964
PDF (26.8 MB)
Challis 1960
PDF (29.0 MB)
Challis 1963
PDF (26.6 MB)
Challis 1989
PDF (28.4 MB)
Challis 1989 (ver. 1)