With the steady trickle of new SPGs which are coming out from the major manufacturers, new reference on the subject is always welcome.

Concord Publications have just announced the first (in a two-volume series) on German Sturmartillerie (Self-Propeled Artillery):

7029 - German Sturmartillerie at War Vol.1

This new book is written by Frank V. De Sisto (with color plates by Laurent Lecocq) and, follows the usual format in their useful Armor at War Series - the book has 72 pages, 163 photos and 16 color plates. For those who require it, it carries the ISBN 962-361-652-X