Principio Furnace, Cecil County, Maryland
circa 1860
circa 1860
circa 1920
1970
1861-1863
1863
circa 1870-1880
circa 1870-1880
1844
circa 1830
circa 1904-1930
circa 1834-1852
1890-09-19
1898
circa 1890
undated
1957
1940-04-07
1948
1948-10-20
circa 1904
1921
1921
1921
1921
1921
1921
circa 1890
circa 1800
circa 1889
1946-10-05
1817-06-26
circa 1910
circa 1900
1951-09
undated
1912 or 1914
circa 1818
circa 1802
circa 1804-1806
1807-10-13
circa 1810
circa 1790
1951-09
circa 1835-1850
circa 1801
1799-08-31
1796-06-14
1848
1792
circa mid-19th century
circa 19th century
circa 19th century
circa 1800
1843-04-23
1769-75
circa 1850s
circa 1767-1798
1953-08
circa 1911-1936
undated