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(1980). Cosmos (1st ed.). New York: Random House. pp. 337–338. ISBN 978-0-394-50294-6. "History of Life on Earth | Smithsonian National Museum of Natural...

Sagan, Carl (1980). Cosmos. New York: Random House. p. 68. ISBN 978-0-394-50294-6. "Duillier, Nicholas Fatio de (1664–1753) mathematician and natural...

OCLC 4493944. —— (1980). Cosmos (1st ed.). New York: Random House. ISBN 978-0-394-50294-6. LCCN 80005286. OCLC 6280573. ——; Ehrlich, Paul R.; Kennedy, Donald;...

Sagan C (1980). Cosmos. New York City: Random House. p. 107. ISBN 978-0-394-50294-6. Basalla G (2006). "Percival Lowell: Champion of Canals". Civilized...