
Etna Furnace and Union Furnace stand as markers of the region's industrial heritage, situated along the complex drainage network of Sinking Run and the Little Juniata River. The landscape is defined by the sharp ridgelines of Brush Mountain and Canoe Mountain, which channel settlement into the productive Sinking Valley and Canoe Valley. This area is particularly dense with genealogical interest, preserved through numerous small burial grounds including the Saint Johns Lutheran Cem, the Amish Cem, and the Yellow Springs Henrys Lutheran Cem.
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1901 · Huntingdon
USGS Topo · 1:62,500
1902 · Hollidaysburg
USGS Topo · 1:62,500
1903 · Hollidaysburg
USGS Topo · 1:62,500
1904 · Huntingdon
USGS Topo · 1:62,500
1920 · Altoona
USGS Topo · 1:62,500
1922 · Altoona
USGS Topo · 1:62,500
1923 · Tyrone
USGS Topo · 1:62,500
1929 · Tyrone
USGS Topo · 1:48,000
1933 · Tyrone
USGS Topo · 1:62,500
1946 · Tyrone
USGS Topo · 1:62,500