Many of the castles listed here are currently in the care of Cadw: Welsh Historic Monuments. Cadw publishes informative and colorful guidebooks full of photographs and history for most of the castles in their care; they are some of the best short reference materials on Welsh castles available. Their publications can be purchased directly through the post at a cost of L2.00-L3.00 or $3.50-$4.50 each (excluding shipping) and are well worth the investment. Visit the official Cadw web site for more information including their address and phone number.