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Legend (web_mercator/nos_hydro_dynamic)

Surveys with BAGs (0)
Surveys with Digital Sounding Data (1)
pre-1950 pre-1950
1950-1959 1950-1959
1960-1969 1960-1969
1970-1979 1970-1979
1980-1989 1980-1989
1990-1999 1990-1999
2000-2009 2000-2009
2010-present 2010-present
<all other values> <all other values>
Surveys without Digital Sounding Data (2)