TY - RPRT TI - GSMGRASS: a program to convert a GSM data base into ASCII files that can be imported directly into the Geographic Resources Analysis Support System (GRASS), Part A - Documentation AU - Gary I. Selner AU - Joseph L. Plesha PY - 1990 DO - 10.3133/ofr90539a UR - https://pubs.usgs.gov/publication/ofr90539A ID - ofr90539A ER -