Val Hildreth-Werker

Extraterrestrial Subsurface Technology Test Bed: Human Use and Scientific Value of Martian Caves

S. L. Thompson, Penelope J. Boston, Reid Frederick, 2004 .

Human utilization of subsurface extraterrestrial environments: Final report

Penelope J. Boston, Reid Frederick, S. M. Welch, 2003 .

Cave Management Plan for an Underground Laboratory: La Cueva de Las Barrancas, Prototype Site for Mars Studies

Jim C. Werker, Val Hildreth-Werker, 2001 .