As the other kind reply to your comment said, sometimes access to open stacks and circulating privileges are distinct. Here in Minnesota, any member of the general public can enter the open stacks of all the University of Minnesota Libraries. I can readily gain circulating privileges as a "friend of the library" for a small fee, made smaller in my case because there is discounted membership fee for being a friend of the library for members of the University of Minnesota Alumni Association.
When I lived in Washington State, I had no particular connection with U Dub, but I could also walk onto campus and walk into the library shelving areas with no problem. When I wanted to circulate books, I looked up the state administrative regulations (it helped that I was working as a lawyer, so I knew how to look those up) and found out that a state regulation basically allows most state residents to obtain circulating privileges at University of Washington libraries for the payment of a small fee. That library has a GREAT collection of materials on east Asian languages, and I circulated some of those while I was living in Washington state.
When I lived in Washington State, I had no particular connection with U Dub, but I could also walk onto campus and walk into the library shelving areas with no problem. When I wanted to circulate books, I looked up the state administrative regulations (it helped that I was working as a lawyer, so I knew how to look those up) and found out that a state regulation basically allows most state residents to obtain circulating privileges at University of Washington libraries for the payment of a small fee. That library has a GREAT collection of materials on east Asian languages, and I circulated some of those while I was living in Washington state.