1. Ball , F. C. G. R. Downs Report of investigations, study of possible connection between operation of RMA disposal well and earthquake in Derby, Colorado, area Report of Investigations, Injection Well Earthquake Relationship, Rocky Mountain Arsenal, Denver, Colorado Omaha, Nebr. 1966
2. Ball , F. C. P. E. Sells G. R. Downs RMA disposal well, review of original records, period of June 1961 through January 1962, report Omaha, Nebr. 1966
3. Carder , D. S. Evaluation of seismicity in the Denver area Report of Investigations, Injection Well Earthquake Relationship, Rocky Mountain Arsenal, Denver, Colorado Omaha, Nebr. 1966
4. The Denver area earthquakes and the Rocky Mountain Arsenal disposal well;Evans;Mt. Geol.,1966