Books by Rob Nagel
Space Exploration Reference Library
U.X.L encyclopedia of landforms and other geologic features
UXL Encyclopedia of Landforms Edition 1
UXL Hispanic American biography
U-X-L encyclopedia of science
UXL Encyclopedia of Science (10 Vol. Set)
Body by design
Endangered Species (Endangered Species (3 Vol.))
U℗ʺX℗ʺL encyclopedia of science
Hispanic American biography
Agro-ecology