Isotropy of Underground Muons
Barrows, S.C. et al.1977, ICRC, 2,176.

Operational Characteristics of the Utah Anisotropy Detector
Groom, D.E. et al.1977, ICRC, 2,616.

Measurement of Light Emission from Remote Cosmic-Ray Air Showers
Bergeson, H.E. et al.1977, Phys. Rev., 39,847.