TY - RPRT TI - Structure contours on top of the Fall River sandstone, NE corner of the Edgemont quadrangle, Fall River County, South Dakota, fig. 9 AU - John Donald Ryan PY - 1955 DO - 10.3133/ofr55155 UR - https://pubs.usgs.gov/publication/ofr55155 ID - ofr55155 ER -