Looking for a book that discusses minhag Ashkenaz in detail with sources. I am specifically interested in minhagim that were practiced in the Oberland of Europe.
שרשי מנהג אשכנז by R' Rav Binyomin Shlomo Hamburger (4 vols) is a popular set on the 'Yekkishe' Minhag. While it is out of print, some stores still sell it, and a new edition is being prepared. Find out more and see sample pages at their website.