Patterson Viaduct, Baltimore and Ohio Railroad
1830
1830
1831-09-22
after 1848
1861-04-21
1845
circa 1870
circa 1993
1904
1914-08-01
1914-08-01
1976-01-10
1971-07-01
1900-10
1950-10-03
1897
circa 1867
1889-08
1888
1888-09
1888
circa 1970
circa 1970
circa 1970
circa 1910
circa 1910
circa 1910
circa 1910
circa 1910
circa 1925
1913-01-21
1913-01-22
1913-02-28
1913-02-28
1913-03-31
1913-03-31
1913-03-12
1913-03-12
circa 1929
circa 1970s
1953-03
circa 1812
circa 1952
circa 1812
circa 1810-1815
circa 1800
1992-1993
undated
undated
1792
1852
1855
1949-07-10
1942-06-03
1859-06
1917-05-14
1980-03-08
circa 1967–1983
1942-12-20
1845
1776