Information Research Weblog

I got a nasty shock tonight when I tried to resume my analysis of the way Weblogs were linking to my paper on knowledge management. I re-ran my search, which had previously revealed about 110 links and this time Google reported no pages! And this was when I used the search for a URL feature in the Advanced search. When I ran the same url in the ordinary search box it came up with 34 links. What's going on here? Does Google drop Weblogs after a certain period of time, or is it only searching on the current pages and dropping the archives?