Many of Bruckner's musical manuscripts are now online from the Austrian National Library in Vienna. To view the manuscripts, click here. In the search window, the best way to find a symphony is to type in the WAB numbers (WAB 102 = Symphony No. 2). Not all manuscripts are online as of this writing, but the ones that are will have a 'Digitalisat' link on the page. The resolution is very high and you can zoom in for a very close look.
More recently, many of these these scores can be accessed easily through links at the Petrucci Music Library, www.imslp.org