This link takes you to the PSAS volume index.
Volumes 34 to 39 inclusive contain articles on RSCs which, despite their age, are almost indispensible.
They comprise a six-part survey by Fred Coles of (probably) all the stone circles in Aberdeenshire and Kincardineshire including fine ground plans and stone measurements in each case.
Many site entries have excellent drawings of the stones (not so good on human figures though!) and, of course, it is always interesting to hear what the writer has to say about the circles based on the local knowledge around at the start of the last century.
Volume 102 has an article by Burl on RSCs including grid references on 74 definite and 18 probable RSC sites.
These PSAS references are all PDF articles, many of them very long.
Other web sites
Megalithics at http://www.megalithics.com/scotland.htm has some good movie panoramas of RSCs including some of the lesser well known ones.
This Aberdeen University site http://www.abdn.ac.uk/~lib266/stones/main.htm#index
has wide coverage of RSCs and other sites. Especially good on directions
Posted by greywether
5th April 2005ce
Edited 5th April 2005ce