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

Click here for DRG's

Click here for DOQQ's
3389A1 LOUISVILLE SOUTH
3389A2 LOUISVILLE SW
3389A3 ETHEL SE
3389A4 ETHEL SOUTH
3389A5 KOSCIUSKO
3389A6 MCADAMS
3389A7 DURANT
3389A8 OWENS WELLS
3389B1 LOUISVILLE NORTH
3389B2 HIGHPOINT
3389B3 MCCOOL
3389B4 ETHEL NORTH
3389B5 KOSCIUSKO NE
3389B6 HESTERVILLE
3389B7 WEST
3389B8 BOWLING GREEN
3389C1 STURGIS
3389C2 ACKERMAN
3389C3 WEIR
3389C4 FRENCH CAMP
3389C5 POPLAR CREEK
3389C6 VAIDEN
3389C7 PEACHAHALA CREEK
3389C8 MURDOCK LAKE
3389D1 DOUBLE SPRINGS
3389D2 REFORM
3389D3 TOMNOLEN
3389D4 STEWART
3389D5 KILMICHAEL
3389D6 WINONA
3389D7 BAILEY LAKE
3389D8 COILA
3389E1 MABEN
3389E2 SAPA
3389E3 EUPORA
3389E4 LITTLE SAND CREEK
3389E5 LODI
3389E6 ESKRIDGE
3389E7 MCCARLEY
3389E8 NORTH CARROLLTON
3389F1 MANTEE
3389F2 HOHENLINDEN
3389F3 BELLEFONTAINE
3389F4 CADARETTA
3389F5 SWEATMAN
3389F6 DUCK HILL
3389F7 TIE PLANT
3389F8 JEFFERSON
3389G1 WOODLAND
3389G2 ATLANTA
3389G3 CALHOUN CITY
3389G4 BIG CREEK
3389G5 GORE SPRINGS
3389G6 KINCAID
3389G7 GRENADA
3389G8 HOLCOMB
3389H1 HOUSTON WEST
3389H2 VARDAMAN
3389H3 BRUCE
3389H4 SKUNKA
3389H5 BENWOOD
3389H6 COFFEEVILLE
3389H7 SCOBEY
3389H8 TILLATOBA