Principio Furnace, Cecil County, Maryland
circa 1860
circa 1860
1959-10
1959-10
circa 1949-02
1992-1993
1992-1993
1992-1993
1992-1993
1992-1993
1942
circa 1940-1943
1859
1858-11-06
circa 1850
1776-07-13
1871
circa 1835
1910-09-18
1912 or 1914
1890-09-19
circa 1953-01
circa 1950-11
1949-09
circa 1829-1832
circa 1774
circa 1930
1846
1813-05-28
1673
circa 1855
1911
1976-06-25
1976-02-09
circa 1883-1888
1976-07-16
1976-07-08
1976-07-06
1976-07-02
1903-05-02
1894-07-08
circa 1935-05
circa 1925
1836
1891
circa 1943
1950-12
1945-02
1948-03
1948-03
circa 1948-03
circa 1949-02
1951-02
1992-1993
1992-1993
1992-1993
1992-1993
1992-1993
1992-1993
1992-1993
1992-1993