Encyclopedia of Geography
Barney Warf
Lysander Spooner: Selected Works of a Libertarian Hero (Annotated)
Lysander Spooner
Mathematical Methods in Science
György Pólya
Philosophy and Computer Science
Timothy R. Colburn
Advanced Mathematics 3
C. W. Celia & A. T. F. Nice & K. F. Elliot
Pale Blue Dot
Carl Sagan