Principio Furnace, Cecil County, Maryland
circa 1860
circa 1860
circa 1910s
1911
circa 1949
circa 1905
1866-04-02
1890s
circa 1860
1913-01-21
1913-01-21
1913-01-22
circa 1929
1919
1871
circa 1870
1865-09-30
1788
1928
circa 1984
circa 1955
1949-11
1949-05
1892
1834
circa 1866
1918-1920
1900-1905
circa 1930s
1928
1928
1980s
1928
1887-1889
circa 1910s
circa 1840s
circa 1890s
1780-1785
circa 1900s
1845-1850
1830s
1883
1969
1950s-1960s
1928
1960s
undated
1930s
circa 1883
circa 1883
circa 1883
circa 1883
undated
circa 1835
circa 1900
circa 1915
circa 1915
1933
Not dated
20th century
1796-09-14