
Old Bangor Slate Quarry and various cement works dominate the landscape of the Mount Bethel and Washington townships during the Second World War. The heavy industrial footprint of the Alpha Cement Co and the prominent Lehigh Cement Co Stack near Martins Creek reflect the era's intense production requirements. Transportation networks are densely packed here, with the Pennsylvania and Lehigh and New England railroads tracing the valleys to serve these mineral extraction sites.
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1890 · Easton
USGS Topo · 1:62,500
1891 · Easton
USGS Topo · 1:62,500
1891 · Delaware Water Gap
USGS Topo · 1:62,500
1893 · Delaware Water Gap
USGS Topo · 1:62,500
1894 · Allentown
USGS Topo · 1:62,500
1914 · Wind Gap
USGS Topo · 1:62,500
1916 · Wind Gap
USGS Topo · 1:62,500
1932 · Easton
USGS Topo · 1:62,500
1936 · Delaware Water Gap
USGS Topo · 1:48,000
1939 · Allentown
USGS Topo · 1:62,500