https://www.degruyter.com/document/doi/10.1515/mgzs-2019-0102/htmlKristian Gancer [= Christian Ganzer] [u. a.], Brest, leto 1941 g. Dokumenty, Materialy, Fotografii
This book is collection of 45 I.D. documents in German with translation to Russian According to russian archives, if we speak about 1941, the quantity of info is close to nothing. There are two reasons:
1. no one in the fortress recorded the course of events, only one document is known - Order number 1.
2. the memoirs of the defenders are mostly inaccessible because, if published, they can harm the official version of the defense.
I should explane the situation. There are two version of brest fortress defence-1941.
1. Oficial geroic version reliased in communists period and supported by existing goverments.
2. Historical version studied on this site.
The common between them - place and names, not more than that.