Harley and Woodward's History of Cartography Online

http://www.press.uchicago.edu/books/HOC/index.html

From the home page:

The first volume of the History of Cartography was published in 1987 and the three books that constitute Volume Two appeared over the following eleven years. In 1987 the worldwide web did not exist, and since 1998 book publishing has gone through a revolution in the production and dissemination of work. Although the large format and high quality image reproduction of the printed books (see right column) are still well-suited to the requirements for the publishing of maps, the online availability of material is a boon to scholars and map enthusiasts.

On this site the University of Chicago Press is pleased to present the first two volumes of the History of Cartography in PDF format. Navigate to the PDFs from the left column. Each chapter of each book is a single PDF. The search box on the left allows searching across the content of all the PDFs that make up the first four books.

The PDFs appear to be of individual chapters of the volumes rather than the entire volumes in one go.