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The plural form for the noun bluff is bluffs.
The address of the Poplar Bluff Museum is: Po Box 1083, Poplar Bluff, MO 63902-1083
The address of the Fair Bluff Community Library is: 315 Railroad St, Fair Bluff, 28439 M
The address of the Sergeant Bluff Historical Society is: 403 4Th St, Sergeant Bluff, IA 51054
The address of the Poplar Bluff Railroad Museum is: 303 Moran St, Poplar Bluff, MO 63901