Maps of field fortifications

[Der Alte Fritz]

I am studying the German theory and practice of defence and want to find some maps of German defences at Divisional or below level. I have a lot of knowledge of how individual positions were built but not how they were laid out in practice to form a defensive position.

[Prasauskas]

But I think that besste fortifikation is in Finland Army.in lithuanisch and englisch language printed in USA -Žilys,,Suomių -Rusų karas,,/Finnen-Russen War,,/it writhe Prasauskas,Lithuania.