In reply to Pete Pozman:
A while since I've read any of his books & most of them are still (hopefully) in storage back in Scotland. I guess his classic is 'The making of the crofting community' but that was published in the mid 1970s so maybe is a little dated. I also really enjoyed 'A dance called America : the Scottish Highlands, the United States and Canada. Edinburgh' and 'On the other side of sorrow : nature and people in the Scottish Highlands'. Not specifically about the clearances but a good general history is 'Last of the free : a millennial history of the Highlands and Islands of Scotland'. I've not read 'Set Adrift Upon the World: The Sutherland Clearances' but might be closest to "on the Clearances".