1
Book
2
4
Book
5
6
7
9
Book
10
Book
11
12
Published: Bonn u.a. : Bouvier
Book
13
Book
14
15
16
17
Book
18
Book
19
Published: Leipzig : Brandstetter, 1940
Book
20
Published: Berlin : Verl. "Rhein. Beobachter", 1925
Book