Is there a site with the tracking information for the old space station Mir? Or some place with the data location tracking information still available? Maybe even a site with orbital mechanics backwards in time?
CelesTrack has Mir ephemerides (as TLE, two-line element sets) in its NORAD Two-Line Element Sets Historical Archives. It's a 755 KB in size ZIP archive (direct link) packing a text file with 22,333 TLE spanning time period from February 19, 1986 to March 23, 2001 when it was deorbited. If these don't go far enough back in time for your needs, you can request even earlier TLE by filling and submitting this form (use 16609 as Mir's 5-digit NORAD catalog number).