Sue McDonald,
Mir Mission Chronicle
(1998)
“ In addition to the three Atlantis dockings and the initial dockings of Priroda and Spektr, seven Progress-M and four Soyuz-TM dockings occurred between November 1994 and August 1996. Soyuz-TM 20, Soyuz-TM 21, and Progress-M 32 were each undocked and redocked once. Six relocations of Kristall, Spektr, and Priroda brought the total number of dockings for the period to 23. Using the icon concept developed for "Mir Hardware Heritage," each configuration is depicted at the left of the narrative description of mission events. A key to the individual icons is given in figure 1. ”
