Brubaker has surveyed some 10,000 pages of early Quran manuscripts, documenting post-production physical corrections. To date, he has noted and described thousands, with various causes including (but not limited to) simple scribal error. Brubaker is working on several academic books, but has found the subject is also of interest to non-academic readers. "Corrections in Early Qurʾān Manuscripts: Twenty Examples" is an introduction to the range of the phenomenon, written to be accessible to non-specialists. In it, he selects a group of corrections from a variety of early Quran manuscripts of this early period. For each example, he shows a picture and gives a brief description, followed by a diagram showing the correction in relation to a modern standard edition of the Quran.