Native peoples from three eras depicted their civilizations in rock pi...
Title, date, and keywords based on information provided by the photographer. Credit line: The Lyda Hill Texas Collection of Photographs in Carol M. Highsmith's America Project, Library of Congress, Prints and P... More
Native peoples from three eras depicted their civilizations in rock pi...
Title, date, and keywords based on information provided by the photographer. Credit line: The Lyda Hill Texas Collection of Photographs in Carol M. Highsmith's America Project, Library of Congress, Prints and P... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Etched stone depicting several figures of three civilizations, on a bu...
Public domain image of horse riding, cavalry, military, war, 17th, 18th century, free to use, no copyright restrictions - Picryl description
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
![[Main Reading Room. Interior of dome displaying half of the Evolution of Civilizations mural in collar. Library of Congress Thomas Jefferson Building, Washington, D.C.]](https://cache.getarchive.net/Prod/thumb/cdn18/L3Bob3RvLzIwMTkvMTEvMTYvbWFpbi1yZWFkaW5nLXJvb20taW50ZXJpb3Itb2YtZG9tZS1kaXNwbGF5aW5nLWhhbGYtb2YtdGhlLWV2b2x1dGlvbi1vZi1jaXZpbGl6YXRpb25zLWE3ZDRhMi0xMDI0LmpwZw%3D%3D/40/30/webp "[Main Reading Room. Interior of dome displaying half of the Evolution of Civilizations mural in collar. Library of Congress Thomas Jefferson Building, Washington, D.C.]")
[Main Reading Room. Interior of dome displaying half of the Evolution ...
Forms part of the Library of Congress Series in the Carol M. Highsmith Archive.
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More