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Corliss, William R. (1974). "Histories of the Space Tracking and Data Acquisition Network (STADAN), the Manned Space Flight Network (MSFN), and the NASA Communications Network (NASCOM)". NASA Technical Report CR-140390. 75: 10981. Bibcode:1974STIN...7510981C. hdl:2060/19750002909. 100 MB PDF file. Explicitly non-copyrighted.