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Historical Values
Year Value
1996 none; the US Government has not approved a standard for hydrographic codes - see the Cross-Reference List of Hydrographic Data Codes appendix
1997 none; the US Government has not approved a standard for hydrographic codes - see the Cross-Reference List of Hydrographic Data Codes appendix
1998 none; the US Government has not approved a standard for hydrographic codes-see the Cross-Reference List of Hydrographic Data Codes appendix
1999 none; the US Government has not approved a standard for hydrographic codes--see the Cross-Reference List of Hydrographic Data Codes appendix
2000 none; the US Government has not approved a standard for hydrographic codes - see the Cross-Reference List of Hydrographic Data Codes appendix