1. Soil radon monitoring for earthquake research: A study of radon concentrations using alpha-particle senstiive films in shallow soil holes along the San Jacinto Fault in Southern California;Birchard,1978
2. An inexpensive radon earthquake prediction concept;Birchard;Eos Trans. AGU,1976
3. Gas phase radon anomalies;Birchard;Eos Trans. AGU,1977
4. Earthquake associated radon anomalies: Possible mechanisms;Birchard;Eos Trans. AGU,1978
5. The effect of atmospheric pressure variation on the transport of 222 Rn from the soil to the atmosphere;Clements,1974