The ICOMOS-IAU Thematic Study on The Heritage Sites of Astronomy and Archaeoastronomy in the context of the UNESCO World Heritage Convention was published as an e-book in Jun 2010. It was presented to the 2010 meeting of UNESCO's World Heritage Committee, where it was duly approved. It has since been circulated officially by the WHC to all of UNESCO's National Commissions.
Thanks to financial sponsorship by both the International Astronomical Union and the International Council on Monuments and Sites (ICOMOS), a limited full-colour printed edition was published in 2011. Although the text is almost unaltered, the layout has been slightly changed from the e-version in order to conform to new ICOMOS formatting guidelines.
Printed copies are available from Ocarina Books.
The e-version of the report is still available for free. Click here to download selected parts or the entire report.
For more information about the Thematic Study see here.