The Royal Commission on the Ancient and Historical Monuments of Wales http://www.rcahmw.gov.uk/
The Royal Commission is the investigation body and national archive for the historic environment of Wales. It has the lead role in ensuring that Wales’s archaeological, built and maritime heritage is authoritatively recorded, and seeks to promote the understanding and appreciation of this heritage nationally and internationally.
Coflein is the online database for the National Monuments Record of Wales (NMRW)
The Mills Archive http://www.millsarchivetrust.org/
The Mills Archive was established in 2002 as a permanent repository for historical and contemporary material on traditional mills and milling, and to make that material available for public inspection and use in research and learning. It has rescued over 1 million documents and images that might otherwise have ended up in a landfill site.
The Society for the Protection of Ancient Buildings, Mills Section http://www.spab.org.uk/spab-mills/
The International Molinological Society http://www.molinology.org/
Midlands Mills Group http://www.midlandmills.org.uk/
Federation des Moulins de France http://www.fdmf.fr/
John Brandrick’s Mill Drawings http://a0tech.co.uk/index.html