TY - RPRT TI - Geohydrology of the shallow aquifers in the Greeley-Nunn area, Colorado AU - Stanley G. Robson AU - L. R. Arnold AU - Janet S. Heiny PY - 2000 DO - 10.3133/ha746a UR - https://pubs.usgs.gov/publication/ha746A ID - ha746A ER -