Are all of the Archives' collections on the internet?

No, the vast majority of the Archives' collections are not on the internet.  Samples of photos from some of the collections have been digitized and are available for viewing on the Portal to Texas History at http://texashistory.unt.edu  But in order to conduct research in the Archives' collections, you will need to physically come to the Archives itself in room 430 of the Willis Library Building and ask for help.