I've been slow to upload these two documents because Polar wasn't finished with either of them, but I decided to upload what I had for now. The census seems 'finished' by Polar's standards if I recall correctly. The timeline is certainly not finished. Both of these documents are very valuable for the archival initiative, but they should still be viewed with scrutiny. You can find them in the new Research folder under Polarlab's own folder in the Archive Library.
In short summary, the clan census is an attempt to list all clanners...ever, by clan. It essentially allows you to see 'all' total members of a clan. The way he went about it was checking photos and comments and such. This doesn't mean that everyone listed was a member of the clan at the exact same time as everyone else. This does not account for temporal factors. Clearly there are many members left out of the list that Polar missed, and some may be alternate accounts for other members that skew the numbers. Still, this remains our clearest picture of clan population statistics that we have (next to the LBPU Census of course...that also has its own major flaws.)
The timeline attempts to 'correct' things Polar screwed up in his autobiography and add more details, such as precise dates. He claims he uses level publish dates to figure out exact dates of happenings. This one is definitely not finished, as he hasn't even gotten to Khorne Empire yet.