21. Map showing the distribution of anomalous concentrations of gold and silver in stream sediment, heavy-mineral concentrate, and aquatic moss in the Idiatrod quadrangle, Alaska Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Information Services Resource Type: Map Access & Availability: Loading
22. Geologic map of the Russell quadrangle, Costilla County, Colorado Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Information Services Resource Type: Map Access & Availability: Loading
23. Geologic map of the Arivaca quadrangle and vicinity, Pima and Santa Cruz counties, Arizona Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Information Services Resource Type: Map Access & Availability: Loading
24. Map showing the distribution of anomalous concentrations of mercury, antimony, and arsenic in stream sediment, heavy-mineral concentrate, and aquatic moss in the Iditarod quadrangle, Alaska Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Information Services Resource Type: Map Access & Availability: Loading
25. Maps showing locations of known Mississippi Valley-type deposits and occurrences in the Ozark Mountains region relative to late Cambrian shaly lithofacies, and other shales, Missouri, Arkansas, Kansas, and Oklahoma Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Geological Survey Information Services Resource Type: Map Access & Availability: Loading
26. Geologic map of the Texas Mountain quadrangle, Rio Blanco County, Colorado Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Information Services Resource Type: Map Access & Availability: Loading
27. Map showing the distribution of anomalous concentrations of copper, lead, zinc, tin, and tungsten in stream sediment and heavy-mineral concentrate in the Iditarod quadrangle, Alaska Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Information Services Resource Type: Map Access & Availability: Loading
28. Cross sections showing stratigraphic and depositional lithofacies of upper Cambrian rocks and the relation of lithofacies to potential for Mississippi Valley-type mineralization in the Harrison 1⁰ x 2⁰ quadrangle, Missouri and Arkansas Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Geological Survey Information Services Resource Type: Map Access & Availability: Loading
29. Maps showing petroleum exploration intensity and production in major Cambrian to Ordovician reservoir rocks in the Anadarko Basin Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Information Services Resource Type: Map Access & Availability: Loading
30. Geologic map of the Bracey 7.5-minute quadrangle, Mecklenburg County, Virginia, and Warren County, North Carolina Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Information Services Resource Type: Map Access & Availability: Loading