. . "United States. Census Office. 6th census, 1840." . . . . . . "Alabama 1840 census index"@en . . "Alabama 1840 census index" . . . . . . . . . . "Indexes"@en . "Indexes" . . . "Alabama 1840 census index : index"@en . "United States, Alabama" . . "Alabama" . . "1840" . .