In 2011, the University of Chicago Press - in a magnanimous gesture to all potential readers - placed the first two volumes (i.e. four books) Online, with a separate PDF for each chapter. Their entire text can be searched simultaneously.
In June 2013 the whole of the vast Volume 3 was placed online as well: Part 1 and Part 2.
J. B. Harley and David Woodward (eds), The History of Cartography (Chicago and London: University of Chicago Press, 1987- ):
Volume 2, Book 1 (1992): Cartography in the Traditional Islamic and South Asian Societies.
Volume 2, Book 2 (1994): Cartography in the Traditional East and Southeast Asian Societies.
Volume 2, Book 3 (1998): Cartography in the Traditional African, American, Arctic, Australian, and Pacific Societies. [Full text of the Introduction by David Woodward and G. Malcolm Lewis].
Volume 3 (2007): Cartography in the European Renaissance. [In two books]
Volume 4 (in preparation - edited by Matthew Edney and Mary S. Pedley): Cartography in the European Enlightenment
Volume 5 (in preparation - edited by Roger Kain): Cartography in the Nineteenth Century
Volume 6 (2015, edited by Mark
Monmonier): Cartography in the Twentieth Century
The History of Cartography Project, Department of Geography, University of Wisconsin, Madison, WI 53706, issues an occasional newsletter with details of the publication schedule for forthcoming volumes - see their Homepage for details and, since August 2010, news on their Facebook page.