Joy Division vinyl collection

Joy Division only released 2 studio albums before Ian Curtis' untimely death: "Unknown Pleasures" and "Closer."  Interestingly Wikipedia shows they have 12 compilation albums.  How can you get 12 compilation albums worth of content from 2 studio albums??

I have 10 pieces of vinyl from Joy Division, all purchased between 1982 and 1984.  There are the 2 studio albums (at the top of the photo), three  12" singles ("Transmission", "Atmosphere" - first 2 in the second row, and "Love Will Tear Us Apart" - first in the third row), and the compilation double album "Still" (right end of second row)

The last three are bootleg albums (the second, third and fourth in the bottom row).  The first is "Atmosphere" containing almost all non-album cuts: the non-album singles "Transmission" and "Atmosphere," the b-sides "Novelty" and "These Days," 1 track from "Closer" and 4 other songs not on the 2 studio albums (but 3 of these are on Still) - apparently this is a German bootleg recorded in mono.  The second is "Disorder" an 8-track live recording at High Wycombe Town Hall on the 2nd of February of 1980 according to the cover (the same 8 tracks in the same order as the first 8 tracks on the bonus live CD that was included with the 2007 re-release of "Still," except stated to be on a different date - although online resources say this bootleg LP is the same concert).  The third is "Class Is" (the cover font looks like "Glass Is" but the record labels themselves are clear showing that it is indeed "Class Is") which, at first glance, seemed to be an early compilation album, but when I played it I realised it was a live bootleg album - all songs are from the studio albums except for the non album singles "Love Will Tear Us Apart" and "Transmission".  See the track listings in the image below.  A little research online shows it to be recorded at Electric Ballroom, London on 26th October 1979.  I hadn't listened to these three LPs pretty much since I bought them, and now I've listened to them again.  The sound quality on the first is okay, but the other two are fairly bad.

In 1991 I also picked up another compilation album on CD, "Substance."