1. Waterfall Cave, Southern Chihuahua, Mexico
2. 1959 Unpublished data.
3. 1960 The effect of physical exercise on the metabolic potential, a crucial measure of physical fitness. Colloqium on Exercise and Fit-ness. The University of Illinois College of Phys-ical Education and the Athletic Institute Cham-paign-Urbana, Illinois.
4. 1960 Work capacity at altitude. In: Symposium of Exercise and Sports Science. ed., Harper Publishing Co., New York.