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Hi Patty,
I  would suggest contacting the Army Corps of Engineers in New Orleans.
 
Harry Zohn
USGS
 
>>> "Patricia A. Gaspari-Bridges" <<a href="/scripts/wa-UGA.exe?LOGON=A3%3D9803%26L%3DMAPS-L%26E%3D7BIT%26P%3D279763%26B%3D--%26T%3Dtext%252FplainTEXT%252FPLAIN%3B%2520charset%3DUS-ASCII%26pending%3D" target="_parent" >[log in to unmask]</a>> 03/20
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We have a patron who needs asap a data file (ascii readable table)
giving
latitude and longitude coordinate the full length of the
Mississippi River with points every half mile.
 
Any help you can give would be much appreciated.
 
Thank you,
Patty Gaspari-Bridges
Map Librarian
Princeton Univ.