You can go to the eBay site. At the top of the home page screen it there is a bar with options - choose the one at the far right “community”, it takes you to a screen that has specialty discussion boards listed on the lower right of the screen. There is one for glassware. You will probably have to register for eBay, but it’s free. It would be very, very helpful, if not necessary, to post pictures. They are a very helpful bunch and that board also has an extensive list of sites for research.
Yes, your local public library will have some good resources–they’re called “books”.
Seriously, though, it’s a better starting point than E-Bay, IMO, because there will be tons of full-color pix right up front, and all you have to do is sit there on the floor in the stacks and turn pages until you see something you recognize.
I couldn’t disagree more - I’ve been an antique and collectibles dealer for more than 20 years - and I can tell you, NO library is going to have an extensive enough section on glass to identify these pieces - I have learned that through the hard experience of years of research. This is especially true with collectible glass there are thousands and thousands of different pieces by hundreds and hundreds of different makers. I stand by my advice - go to the place where the collectors hang out - go to the eBay boards.