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Encyclopedia Astronautica - Detailed information of past and planned space operations, vehicles and technologies.
Beyond Apollo - Plans for the exploration of space from the age of Apollo, 1959-1979.
The Shuttle Era - Plans for the exploration of space from the age of the Space Shuttle, 1980-2012.
Atomic Rockets - Information on how space travel and space craft work within physics and actuality. Also tackles numerous tropes and misconceptions.
U.S. Registry of Space Objects - The 1974 UN Convention on Registration of Objects Launched into Outer Space provides for the national registration by launching states of space objects launched into outer space and for the maintenance of a central register of objects launched into outer space by the Secretary-General of the United Nations. The United States, as a party to the Registration Convention, maintains an official US Registry of Space Objects Launched into Outer Space and provides quarterly updates to the UN Secretary-General on each space object carried on the US Registry. To improve the timeliness and accuracy of the information contained in the US Registry and to make such information more accessible to the public, the Department of State now maintains the US Registry online.
LEO On The Cheap - A free, online book that discusses various ways of getting into space in cheaper ways than have been used in reality. Should be useful for ATLs where different space flight strategies are wanted…