My 2004 study of the Belgo-Dutch enclaves at Baarle-Nassau/Baarle-Hertog is now available for free download (a 65MB pdf) from the University of Melbourne's digital repository:
Whyte, B. R. (2004). "'En territoire belge et à quarante centimètres de la frontière': an historical and documentary study of the Belgian and Dutch enclaves of Baarle-Hertog and Baarle-Nassau". Melbourne: The School of Anthropology, Geography, Environmental Studies, The University of Melbourne.
It provides a full history of the enclaves, translations into English o all relevant treaties, and lots of maps and photos.
Go to http://repository.unimelb.edu.au/10187/9940
and click on the small pdf icon to the RIGHT of 'object" (not the big pdf icon in the otp left, which returns an error)
My earlier book on the Cooch Behar enclaves is also still available, as a 14MB pdf:
Whyte, B. R. (2002). "Waiting for the Esquimo: an historical and documentary study of the Cooch Behar enclaves of India and Bangladesh". Melbourne: School of Anthropology, Geography and Environmental Studies, University of Melbourne.
Go to http://repository.unimelb.edu.au/10187/985
Dr Brendan Whyte
Assistant Map Curator
National Library of Australia