Does anyone know a good reference for important trocken, madeira, port and sherry labels? I know of these wines but know little of the important producers. Thanks.
Check out the producer profiles section: https://www.guildsomm.com/research/wiki/
A Modern Guid to Sherry by Baiocchi has an exhaustive list of producers. Madeira really only has a few negoc to look up.
Also, Sherry, Manzanilla and Montilla from Peter Liem and Jesús Barquín is an incredible book on the subject, complete with producer profiles.