I have the greatest respect for Thom but it has to be said that there are quite a lot of claims that that are starting to unravel . He surveyed so much and there has been so little done since , with the exceptions of Ruggles and Dougie Scott , that we are just beginning to pick up on the mistakes .

Wonder if he wrote any more.

Dunno, but searching for it led me to a nice bit of prose from him -
http://64.233.183.104/search?q=cache:vCtsSHkY50UJ:www.themodernantiquarian.com/user/3401/misc+%22Alexander+Thom%22+poetry&hl=en&ct=clnk&cd=36&ie=UTF-8
Sounds like he approached Callanish in the authentic fashion...

"The long days of buffeting in the Atlantic made one ready to appreciate the quiet and perfect anchorage. At the site one could not but be affected by the surroundings - the mystery of the unknown terrain - the loch lying quiet below and above all the towering stones of the most unspoilt monolithic structure in Britain."