Sola offers different types of Bible Studies to suit the style and format used by various congregations and study groups.  The prefix on the product code indicates the style:
A = Workbook-Style Studies: "Come As You Are" topical Scripture texts and discussion (8.5 x 11 workbook)
B = Reader-Style Studies:  Chapter readings and questions on biblical books (5.5 x 8.5 paperback)