USGS OM [Oil and Gas Investigation] Maps:

OM 10 / MAP SHOWING THICKNESS AND GENERAL CHARACTER OF THE CRETACEOUS DEPOSITS IN THE WESTERN INTERIOR OF THE U.S., $ 10

OM 70 / GEOLOGIC MAP OF EASTERN AND SOUTHERN UTAH, $ 10

OM 90 / PRELIMINARY REGIONAL GEOLOGIC MAP OF PARTS OF CULBERSON AND HUDSPETH COUNTIES, TEXAS, $ 10

OM 94 / GEOLOGY OF NAVAL OIL SHALE RESERVES 1 AND 3, GARFIELD COUNTY, COLORADO, $ 10

OM 109 / GEOLOGY AND COAL RESOURCES OF THE DURANGO AREA, LA PLATA AND MONTEZUMA COUNTY, COLORADO, $ 10

OM 112 / GEOLOGY OF THE LANDER AREA, CENTRAL WYOMING, $ 10

OM 120 / GEOLOGY OF DOVE CREEK AREA, DOLORES AND MONTEZUMA COUNTY, COLORADO, $ 10

OM 151 / GEOLOGY OF THE STEAMBOAT BUTTE-PILOT BUTTE AREA, FREMONT COUNTY, WYOMING, $ 10

OM 152 / GEOLOGIC MAP OF THE MESA VERDE AREA, MONTEZUMA COUNTY, COLORADO, $ 10

OM 155 / GEOLOGY OF THE SHERIDAN AND MCMINNVILLE QUADRANGLES, OREGON, $ 10

OM 160 / GEOLOGY OF THE CARRIZO MOUNTAINS AREA IN NORTHEASTERN ARIZONA AND NORTHWESTERN NEW MEXICO, $ 10

OM 161 / GEOLOGIC MAP OF THE WALSENBURG AREA, HERFANO COUNTY, COLORADO, $ 10

OM 164 / GEOLOGIC AND STRUCTURE MAP OF THE SUSSEX AND MEADOW CREEK OIL FIELDS AND VICINITY, JOHNSON AND NATRONA COUNTY, WYOMING, $ 10

OM 166 / GEOLOGIC MAP OF THE DU NOIR AREA, FREMONT COUNTY, WYOMING, $ 10

OM 169 / PRELIMINARY MAP SHOWING GEOLOGIC STRUCTURE OF PART OF GRAND AND SAN JUAN COUNTIES, UTAH, $ 10

OM 174 / GEOLOGIC MAP OF THE TRINIDAD-AGUILAR AREA, LAS ANIMAS AND HERFANO COUNTY, COLORADO, $ 10

OM 177 / PRELIMINARY STRUCTURE CONTOUR MAP OF A PART OF SOUTHEASTERN NEW MEXICO SHOWING OIL AND GAS DEVELOPMENT, $ 10

OM 180 / GEOLOGIC MAP OF THE EASTERN BEAVER DIVIDE-GAS HILLS AREA, FREMONT AND NATRONA COUNTY, WYOMING, $ 10

OM 181 / GEOLOGY OF THE SHELDON - LITTLE DOME AREA, FREMONT COUNTY, WYOMING, $ 10

OM 183 / PRELIMINARY GEOLOGIC MAP OF THE NORTHERN PART OF THE RATON MESA REGION AND HUERFANO PARK IN PARTS OF LAS ANIMAS, HUERFANO, AND CUSTER COUNTY, COLORADO, $ 10

OM 187 / GEOLOGY OF THE SOUTHEASTERN PART OF THE ROBINSON MOUNTAINS, YAKATAGA DISTRICT, ALASKA, $ 10

OM 188 / GEOLOGY OF THE DOTY-MINOT PEAK AREA, WASHINGTON, $ 10

OM 189 / RECONNAISSANCE GEOLOGY OF THE MALASPINA DISTRICT, ALASKA, $ 10

OM 190 / PRELIMINARY GEOLOGIC MAP OF WESTERN SAN JUAN BASIN, SAN JUAN AND MCKINLEY COUNTY, NEW MEXICO, $ 10

OM 191 / GEOLOGIC AND STRUCTURE CONTOUR MAP OF THE NORTHERN AND WESTERN FLANKS OF THE BLACK HILLS, WYOMING, MONTANA, AND IDAHO, $ 10

OM 196 / GEOLOGIC MAP OF A PART OF THE VENTURA BASIN, LOS ANGELES COUNTY, CALIFORNIA, $ 10

OM 199 / GEOLOGY OF THE LEWISTON AREA, FERGUS COUNTY, MONTANA, $ 10

OM 202 / THE BIGHORN DOLOMITE AND CORRELATIVE FORMATIONS IN SOUTHERN MONTANA AND NORTHERN WYOMING, $ 10

OM 208 / RECONNAISSANCE GEOLOGIC MAP OF PARTS OF HARDING, SAN MIGUEL AND MORA COUNTY, NEW MEXICO, $ 10

OM 209 / PRELIMINARY STRUCTURE CONTOUR MAP ON TOP OF SALT IN THE PARADOX MEMBER OF THE HERMOSA FORMATION IN THE SALT ANTICLINE REGION, COLORADO AND UTAH, $ 10

OM 215 / MAP SHOWING DISTRIBUTION AND CONFIGURATION OF BASEMENT ROCKS IN CALIFORNIA, IN TWO SECTIONS (NORTH AND SOUTH), $ 15

OM 216 / GEOLOGIC MAP OF THE THORNBERG OIL AND GAS FIELD AND VICINITY, MOFFAT, AND RIO BLANCO COUNTY, COLORADO, $ 10

OM 217 / GEOLOGIC MAP OF THE SOUTHEASTERN CALIENTE RANGE, SAN LUIS OBISPO COUNTY, CALIFORNIA, $ 10