This historical map portrays the area of Sigma in 2011, primarily covering Oliver Township as well as portions of Spencer, Angling, and Excelsior Township. Featuring a scale of 1:24,000, this map provides a highly detailed snapshot of the terrain, roads, buildings, counties, and historical landmarks in the Sigma region at the time. Published in 2011, it is the sole known edition of this map.
This is the sole edition of this map. No revisions or reprints were ever made.
1949 · Black Creek
USGS Topo · 1:24,000
1949 · Fletcher
USGS Topo · 1:62,500
1950 · Fletcher
USGS Topo · 1:24,000
1954 · Traverse City
USGS Topo · 1:250,000
1956 · Alba
USGS Topo · 1:62,500
1956 · Mancelona
USGS Topo · 1:62,500
1956 · Kalkaska
USGS Topo · 1:62,500
1958 · Traverse City
USGS Topo · 1:250,000
1983 · Traverse City
USGS Topo · 1:100,000
1983 · Grayling
USGS Topo · 1:100,000