The King over the Water(co-written with A[lice] Shield, whose name appears first, Longmans, Green, 1907). Lang had also worked with Shield on the Blackwood’s article, “Queen Oglethorpe” [Feb. 1898].
A Short History of Scotland(Blackwood, 1911) [This Internet Archive Scan is from New York: Dodd, Mead, and Company, 1912]
The Secret Commonwealth of Elves, Fauns, and Fairies: A Study in Folk-Lore & Psychical Research. The Text by Robert Kirk, M. A., Minister of Aberfoyle, A.D. 1691. The Comment by Andrew Lang, M.A. A.D. 1893 (Nutt, 1893)
The Gowrie conspiracy; confessions of George Sprot. London: Printed for private circulation [by Spottiswoode], 1902. [You may find out more about the book here.]
Fiction
The Gold of Fairnilee (Arrowsmith [Bristol], Simpkin, Marshall, and Co. [London], [1888]) [Fairy tale]
A Monk of Fife (1895) [The Internet Archive scan is from 1896.]
Golf, by Horace G. Hutchinson, with contributions by Lord Wellwood, Sir Walter Simpson, Bart., Right Hon. A. J. Balfour, M.P., Andrew Lang, H.S.C. Everard, and Others (Longmans, Green and Co., 1895 [fifth edition, thoroughly revised]. Andrew Lang wrote the first chapter, “The History of Golf,” on pp. 1–28.)
Essays in Little (1891) [The Internet Archive scan is from the 1901 New York Charles Scribner’s Sons edition.] [Chapters of Scottish interest include “Mr. Stevenson’s Works” and “The Poems of Sir Walter Scott.”]
Adventures Among Books (Longmans, Green, and Co., 1901) [This Internet Archive scan is from 1905.] [Some of the chapters of Scottish interest include Lang’s reminiscences of his childhood reading in “Adventures Among Books,” “Recollections of Robert Louis Stevenson,” “Rab’s Friend,” “A Scottish Romanticist of 1830,” “Smollett,” and “An Old Scottish Psychical Researcher.”]
Currently, I have not listed all works that only partially deal with Scotland (in a chapter or in passing). I may add these in the future. Please contact me if you would like to make the case for inclusion of a particular work.
This list was compiled using Roger Lancelyn Green’s Andrew Lang: A Critical Biography, Eleanor De Selms Langstaff’s Andrew Lang, the Andrew Lang listings in Wikipedia, and searches of Internet Archive. WorldCat was consulted when an Internet Archive scan did not exist; however, I did not check WorldCat against every entry (yet). If you are working with a particular text and are unsure of the publication date from other sources, I do recommend that you double-check WorldCat.
Please do contact me if you have any corrections or additions.