Knowledge Encyclopedia
Smithsonian Institution
Cosmic Music
Joscelyn Godwin
Three Contributions to the Theory of Sex
Sigmund Freud
Encyclopedia of American Historical Documents
Susan C. Rosenfeld
Human Dignity & the Politics of Human Rights
Hannah Arendt
The Limits to Growth
Donella H. Meadows & Dennis L. Meadows & Jørgen Randers & William W. Behrens III