1
by Zerwer, Antonie, Langstein, Leo
Published 1925
Springer Berlin Heidelberg

2
by Zerwer, Antonie, Kühl, Paul, Langstein, Leo
Published 1921
Springer Berlin Heidelberg

5
by Zerwer, Antonie, Kühl, Paul, Langstein, Leo
Published 1926
Springer Berlin Heidelberg