From the webpage:
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 three 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 six books.
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Links to the parts, which are then divided into separate PDF files of each chapter:
Volume One: Cartography in Prehistoric, Ancient, and Medieval Europe and the Mediterranean
Volume Two: Book 1: Cartography in the Traditional Islamic and South Asian Societies
Volume Two: Book 2: Cartography in the Traditional East and Southeast Asian Societies
Volume Three: Cartography in the European Renaissance, Part 1
Volume Three: Cartography in the European Renaissance, Part 2
Unless you want to index the parts for yourself, remember the search box at this site that searches across all six volumes.
This can be a real time sink, deeply educational but a time sink none the less.