Dialogues and Essays
Lucius Annaeus Seneca
Democratic Ideals and Reality
Halford John Mackinder & Anthony J. Pearce
Principia Mathematica Vol 2.
Bertrand Russell & Alfred North Whitehead
Nikola Tesla und sein Werk
Slavko Boksan
Professor Stewart's Incredible Numbers
Ian Nicholas Stewart
From Stonehenge to Modern Cosmology
Sir Fred Hoyle
Ecoscience: Population, Resources, Environment
Paul R. Ehrlich & Anne H. Ehrlich & John P. Holdren
Piaget's Theory, a Primer
John L. Phillips