This topic is right up my alley. I collect Nebraska related items, but really like to focus on Lincoln.
Anything related to the Western League and Nebraska State League Lincoln clubs pre 1947 is extremely difficult to come by.
I also have an extensive collection of Guy W. Green's Nebraska Indians barnstorming team which was based out of Lincoln.
edited to add: I find almost nothing locally. If it were not for ebay I would not be collecting this way.