Wow, so many sites, so little time, lol
Depression and elegant:http://chataboutdg.com/gallery/
I'm sure I just barely scratched the surface, but I have to go to that four letter word---- WORK
For books, I think if you search the PGP board there is a huge thread about book suggestions.
DO NOT buy the book: McCain's Field Guide to Pattern Glass. It is famous for mistakes and cost me a lot of time and problems before I learned that.
I don't agree about McCain's Field Guide. For EAPG, it's one of two basic books that are my top recommendation for that category and is a big money saver so you don't have to buy books on a particular company or form or an EAPG book that's limited to only the most popular patterns.
The Field Guide (don't buy her other earlier books) is a CAD publication with all diagrams of patterns arranged by motif such as people, animals, flowers, squares, circles, etc. Once you find your pattern, then you can go to the second book, the Wallace-Homestead Price Guide to Pattern Glass, 11th Ed. which has photographs in black and white, and updated information and corrections that apply to McCain. From there you can further verify with reliable online searches. The advantage of using this with the Field Guide is that if you have the W-H alone, you have to go through the entire book which is in alphabetical order, to find the pattern you're looking for, but McCain makes that easy.
Just my 2 cents, but as long as you know that McCain's has errors and you need to double check her attributions, it is helpful as it is arranged by pattern elements.
The most common error I have found in McCain's is her attributions to U.S. Glass. It seems that US Glass sold a lot of existing stock from the glassmakers that were joined to form that company.
It's not nearly as useless as the Pattern Glass book by Edwards and Carwile, the patterns are in alpha order and there are hundreds of errors, and not just attribution errors.
Where are you from? I notice you mention Sowerby & Bagley, which are both non American makers. Most of the peeps on this board are based in the US, so most of the books they are likely to recommend are books related to that market. If you live somewhere else then many of the book recommendations wouldn't be as useful to you.
Most books deal with patterns and colors ( I also noticed you use the Great Britian spelling) manufacturing techniques and additives.
Good catch, MSGood2shoe! European?--I didn't catch the spelling of colour/color.
DoRi already weighed in, and I am not sure she will be back to this post. I think she might have some of the best ideas. If you do not get good answers from this post, try reposting in a day or so and mention the country or area that you are trying to learn about in the subject to get the attention of someone very knowledgeable about your region and the sources associated with it.
If you are going to avoid an EAPG book I would say Edwards and Carwile. That one is truely loaded with errors up the wazoo. The value that I find in McCains is that the patterns are grouped by type, floral, plant, people... It can give you a starting point from which to work. It is one of my most often used books.
Search for Angela Bowey's website.