TY - RPRT TI - Supplementary cross sections and structure contour maps to the preliminary geologic map of the Figure Four Spring quadrangle, Rio Blanco and Garfield Counties, Colorado AU - Ronald C. Johnson PY - 1978 DO - 10.3133/ofr78197 UR - https://pubs.usgs.gov/publication/ofr78197 ID - ofr78197 ER -