History of Space Exploration: Chapter 8, Exercise 1 — Possible Solution
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Salyut 1 | launched 19 April 1971 | mission ended October 1971 | first space station; Soyuz 11 crew died on return
Mir      | launched 20 February 1986 | deorbited 23 March 2001 | about 130 tonnes; 105 visitors; Polyakov 437 days
ISS      | Zarya launched 20 November 1998 | planned operations to end of 2030 | five agencies, fifteen countries; occupied since 2 November 2000