Information Resources About Germany Bizo "Buildings" Series

I need help with this complicated series. Based on Michel data I finally understand all Type differences (at least I hope so), but "Plate flaws" section of Michel is not providing pictures for most of them.
Do you know any on-line resources or books I can try to get more information? Thanks.

I don't know of any online resources. The best reference I know of is the catalog published by the ArGe Bautenserie 1948 (the Buildings Series study group of the BDPh). It's a looseleaf binder that with all parts, costs about €55 direct from the ArGe Bautenserie 1948 or about €75 from Philabooks.

You can get specific subparts for less.

A: Introduction
B: The meat of the catalog, which I think includes plate flaws
C: Frankings
E: Plating
F: Packet Cards

Thanks. I also found this title in Philabooks list of publications:
Wittmann, Dr. H., Bautenserie 1948, Spezialkatalog Dr. Wittmann/ ArGe Bautenserie 1948, 9. Aufl. 1978, 76 S., mit Vergrößerungen der Plattenfehler
(Wittmann, Buildings Series 1948, specialized catalogue with enlargements of the plate faults, 76 pp., 9th edition of 1978"
This one is much cheaper - just 15 Euro. I will probably order this one.