Neanderthals in Wales Stephen Aldhouse-Green, Rick Peterson, Elizabeth A. Walker E-Book (pdf)

Algorithmic and Register-Transfer Level Synthesis: The System Architect's Workbench Donald E. Thomas, Elizabeth D. Lagnese, Robert A. Walker E-Book (pdf)

Guide to Common Plants of Lake Mead National Recreation Area Powell Elizabeth A. Powell, Landau Frederick H. Landau, Walker Lawrence R. Walker E-Book (pdf)