Hi there, I found a John Arrowsmith Map of Australia published in 1850 at a local estate sale and I was wondering if these maps are of any value. It is in pretty good condition. It is a map that folds down to a book size. It is very readable and still retains its color. Just curious as I would like to know a little about it. I would like to eventually get it framed and was wondering, if valuable should I get the protective glass to keep it safe. I look forward to hearing back from anyone who has any knowledge on these maps. Thankyou