A search for a map detail

Radioactive

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Jan 1, 2000
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3238
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In my area there are two "map features" that I would like to define.
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two channels in the Mississippi Sound, Pass Christian and Pass Marianne
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Pass Marianne shows on the current charts. Pass Christian, the actual pass, does not ( Note: The City of Pass Christian does ). It might be currently considered historical. Nevertheless I have been unsuccessful finding either when searching the Govt GNIS. ( I suspect at least partially due to user error ).

Still, I would like to have the actual, official map reference data ( Especially on the Pass of Christian )

Any assistance would be welcome.
 
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