Legend (Imagery/Canterbury_Imagery_Extents)

1925 - 1929 (0) 1935 - 1939 (1) 1940 - 1944 (2) 1945 - 1949 (3) 1950 - 1954 (15) 1955 - 1959 (4) 1960 - 1964 (5) 1965 - 1969 (6) 1970 - 1974 (7) 1975 - 1979 (8) 1980 - 1984 (9) 1985 - 1989 (10) 1990 - 1994 (11) 1995 - 1999 (12) 2000 - 2004 (13) 2010 - 2014 (14) 2015 - 2019 (20) All Boundaries (18)