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

Click here for DRG's

Click here for DOQQ's
3488A2 DETROIT
3488A3 TURON
3488A4 SMITHVILLE
3488A5 NETTLETON
3488A6 SHANNON
3488A7 TROY SE
3488A8 TROY
3488B2 BEXAR
3488B3 TREMONT
3488B4 BEANS FERRY
3488B5 EVERGREEN
3488B6 VERONA
3488B7 BISSELL
3488B8 SOUTHEAST PONTOTOC
3488C2 SHOTTSVILLE
3488C3 FULTON SE
3488C4 FULTON
3488C5 MOOREVILLE
3488C6 TUPELO
3488C7 SHERMAN
3488C8 NORTHEAST PONTOTOC
3488D2 RED BAY
3488D3 FULTON NE
3488D4 KIRKVILLE
3488D5 RATLIFF
3488D6 GUNTOWN
3488D7 ELLISTOWN
3488D8 NEW ALBANY EAST
3488E2 BELMONT
3488E3 PADEN SE
3488E4 MARIETTA
3488E5 WHEELER
3488E6 BALDWYN
3488E7 PLEASENT RIDGE
3488E8 KEOWNVILLE
3488F1 BISHOP
3488F2 TISHOMINGO
3488F3 PADEN
3488F4 ALTITUDE
3488F5 BOONEVILLE
3488F6 JUMPERTOWN
3488F7 DUMAS
3488F8 RIPLEY
3488G1 MARGERUM
3488G2 IUKA
3488G3 BURNSVILLE
3488G4 GLENS
3488G5 RIENZI
3488G6 KOSSUTH SOUTH
3488G7 PEOPLES
3488G8 FALKNER
3488H1 WATERLOO
3488H2 YELLOW CREEK
3488H3 DOSKIE
3488H4 KENDRICK
3488H5 CORINTH
3488H6 KOSSUTH NORTH
3488H7 CHALYBEATE
3488H8 WALNUT