I’m going to add sites as I come across them and if they translate well.  I’m looking for sites about vintage glass – there are lots of sites on contemporary pieces.

glas-musterbuch.de

The Glass Society         The Carnival Glass Society (UK)

Loetz                                  The Official Website of the Czech Collectors Association 

Pressglas                           Information and History – Scotland’s Glass

Glass Museum Passau  

Danish Glass Museum

Bohemian Glass