1. An automated radon-thoron monitor for earthquake prediction research;Melvin;Nucl. Instrum. and Methods,1978
2. Improvements to the Caltech automated radon-thoron monitoring network;Melvin;Abstract. Eos Trans. AGU,1980
3. Automated radon monitoring at a hard-rock site in the southern California Transverse Ranges;Shapiro;J. Geophys. Res.,1980
4. Recent data from the Caltech automated radon-thoron monitoring network;Shapiro;Abstract. Eos Trans.AGU,1980
5. Rainfall induced changes in subsurface radon levels;Shapiro;Abstract. Eos Trans. AGU,1980