Bremen withian the Weimar Republic
<a href="//commons.wikimedia.org/wiki/User:Sir_Iain" title="User:Sir Iain">Sir Iain</a>, <a href="//commons.wikimedia.org/wiki/User:52_Pickup" class="mw-redirect" title="User:52 Pickup">User:52 Pickup</a>
CC BY-SA 3.0
self-made, using the the map from <a href="//commons.wikimedia.org/wiki/File:Map-WR-Bavaria.svg" title="File:Map-WR-Bavaria.svg">Image:Map-WR-Bavaria.svg</a>.