The Sd.Kfz. 166 - Sturmpanzer IV "Brummbär" is the subject of new volume on Nuts & Bolts series , number 46.
This is partial text from the full article (usually with photos) at https://armorama.com/news/nuts-bolts-sturmpanzer-iv-brummbar
This is partial text from the full article (usually with photos) at https://armorama.com/news/nuts-bolts-sturmpanzer-iv-brummbar