Otis:
Give away glass? Heresy! As a collector, my choice would be to hold on to it for a couple of reasons. First, for reference. Second, to see what else comes to light about it. For example, you find out the name of the book you mentioned. I have a couple of pieces that turned out to be Chinese, but it doesn't make them bad pieces. One of the categories of glass that I collect is pieces I like, no matter their parentage.
Of course, if you're buying to resell and you're trying to maintain a certain standard, then, hello, charity shop.
David