Edinburgh University Press puts out this super Scots Dictionary. It's often very hard to find good a Scots Dictionary or a Good Gaelic Dictionary. This one is VERY good. 820 pages worth, not a little pocket size. It has meanings, spelling variants, pronunciation guide, information on when and were words are used denoting area and districts, grammatical information, and idioms & phrases. What I like best about it - entomologies of the words. So many dictionaries leave off the origins of words, which is so very important when writing history and historical fiction.
It's painstakingly edited and without flaws from start to finish. Best of all it's not teeny print. The print is very clear and easy on the eyes!