German monographs in the LawBod have shelfmarks starting German 450 - 510 The current * collection is shelved on Level 3, one floor up from the entrance level. This collection is not subdivided into legal topics, but arranged (normally) alphabetically by the first author/editor.
Most of the collection of course is in German - but below are some English works which may help first steps.
Comparative studies, which have shelfmarks beginning General or KB are on Level 2, the level at which you enter the library. This collection is not subdivided into legal topics, but arranged (in most instances) alphabetically by the last name of the first named author/editor