Worth a quick mention: The University of Chicago Press has made available online — at no cost — the first three volumes of The History of Cartography. Or what Edward Rothstein, of The New York Times, called “the most ambitious overview of map making ever undertaken.” ….
Volume 1
Gallery of Color Illustrations
Volume 2: Part 1
Gallery of Color Illustrations (Plates 1–24)
Gallery of Color Illustrations (Plates 25–40)
Volume 2: Part 2
Gallery of Color Illustrations (Plates 1–16)
Gallery of Color Illustrations (Plates 17–40)
Volume 2: Part 3
Gallery of Color Illustrations (Plates 1–8)
Gallery of Color Illustrations (Plates 9 –24)
Volume 3: Part 1
Gallery of Color Illustrations (Plates 1–24)
Gallery of Color Illustrations (Plates 25–40)
Volume 3: Part 2
Gallery of Color Illustrations (Plates 41–56)
Gallery of Color Illustrations (Plates 57–80)