John Buchan was the first Lord Tweedsmuir. Since his son John Norman Stuart Buchan was aslo Lord Tweedsmuir, and published under that name, the author page for Lord Tweedsmuir should be kept separate, and the works aliased to the individual page of John Buchan or John Norman Stuart Buchan.
1) Buchan, John, 1st Baron Tweedsmuir, 1875-1940, The Thirty Nine Steps.
2) Buchan, John Norman Stuart, 2nd Baron Tweedsmuir, 1911-1996, Hudson's Bay trader.
3) Buchan, Jane, name error, Under the Moon