The evolution of life on Earth and potential forms elsewhere.
Speculation on interstellar communication. Carl Sagan Unser Kosmos (1982, 276 S , Text) pdf
Comparison of Earth's atmosphere to the hostile conditions of Venus. Blues for a Red Planet: Humanity's fascination with Mars. The evolution of life on Earth and potential forms elsewhere
The transition from astrology to astronomy. Carl Sagan Unser Kosmos (1982, 276 S , Text) pdf
Often released as a hardcover or large-format paperback; contemporary digital versions (PDFs) often replicate the text-heavy or illustrated layouts of these early 1980s prints.