There are three files to download per quad:
xxxxxx.sdw
xxxxxx.sid
xxxxxx.txt

Click here for DRG's

Click here for DOQQ's
3388A3 DANCY
3388A4 MCLEOD
3388A5 MACON
3388A6 MASHULAVILLE
3388A7 FEARNS SPRINGS
3388A8 BOON
3388B3 PICKENSVILLE
3388B4 CLIFTONVILLE
3388B5 BROOKSVILLE
3388B6 LYNN CREEK
3388B7 BARGE LAKE
3388B8 BETHEDEN
3388C3 FORRESTON
3388C4 TRINITY
3388C5 CRAWFORD EAST
3388C6 CRAWFORD WEST
3388C7 BLUFF LAKE
3388C8 BRADLEY
3388D3 NEW HOPE
3388D4 COLUMBUS SOUTH
3388D5 BENT OAK
3388D6 ARTESIA
3388D7 STARKVILLE
3388D8 LONGVIEW
3388E3 STEENS
3388E4 COLUMBUS NORTH
3388E5 WAVERLY
3388E6 WEST POINT
3388E7 CEDAR BLUFF
3388E8 PHEBA
3388F2 MILLPORT NW
3388F3 CALEDONIA
3388F4 HAMILTON
3388F5 STRONG
3388F6 MULDEN
3388F7 PALO ALTO
3388F8 MONTPELIER
3388G2 SULLIGENT SW
3388G3 AMORY SE
3388G4 AMORY SW
3388G5 ABERDEEN
3388G6 PRAIRIE
3388G7 TREBLOC
3388G8 SPARTA
3388H2 SULLIGENT
3388H3 GREENWOOD SPRINGS
3388H4 AMORY
3388H5 WREN
3388H6 EGYPT
3388H7 BUENA VISTA
3388H8 HOUSTON EAST