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Object cannot be cast from DBNull to other types.

Data retrieval:  Data are continuously updated and reviewed. To limit server overheads and download time, limits per query are 7000 records (or 1 year of data) for primary data and 20 years of data for daily data. Do multiple queries to retrieve the full record. 

Station  Label   C.Area kmĀ²  Lat   Long   Site Type

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