Caltech's first Radon-Thoron monitoring station was set up at the school's Kresge Seismological Laboratory in Pasadena

Caltech's first Radon-Thoron monitoring station was set up at the school's Kresge Seismological Laboratory in Pasadena

Caltech's first Radon-Thoron monitoring station was set up at the school's Kresge Seismological Laboratory in Pasadena