So far, when it comes to numbering the books for a libraryMost of the books (except for five) are in X.X notation, one based numbersThere is no indication of how many for the second number, it appears to range from 2 to 17If it has a "B" it usually means big book instead of mass marketNumbering restarts with the big books... sometimesOccasionally they forgot to put the "B resulting in two 6.1, 6.2, and 3.4sBox 3.6 has "B" authors but 3.4 has "C" authors. 3.5 has D authors. Book 3.7 has "B" authors and "F" authors but 3.8 only had "D" and "E" authors3.5B had D&D books in it and almost broke someone's back