Map resources for Portugal Wine
Vineyards.com: Portugal Wine Map
Society of Wine Educators: Portugal Mainland Wine Regions
Wine Folly: Portugal Wine Map
Topographic relief map via Muir Way (super cool to look at to get a sense of the topography … I really want this!).
General articles on Portuguese wine
NY Times (possible paywall): Article from 2010 that I firmly believe kicked off the tourism boom for northern Portugal: Portugal Old New and Undiscovered
Wikipedia: Portuguese Wine
Wine Folly: Wines of Portugal, Organized by Region
World Wide Wine Tours: History of the Wine of Portugal
Grapes and Grains: Portuguese Wine Regions and History
And the book I mention in the video: