I was looking at that site a few days ago and cringed when I came across
These underground comics, or comix (the "x" indicates "X-rated")
But it's definitely a nice collection. Steve Willis also donated hundreds (maybe thousands) of mini-comix to WSU over the years. He began their "counter-culture comix" collection when he worked there and the collection has had one or more name changes since then. I mention it because I think it's even possible that the Willis collection and Lynn Hansen collection may have been merged together (they were friends although this possible merging would have been just coincidence, I believe). I couldn't determine that for sure last week and Willis himself has lost track of what they've done with it (although I didn't go so far as contacting the library).
I have the full catalog (and addendums) that Willis published himself in the mid '80s and have actually been thinking about reprinting them in a small run.