1
by Schnetzer, Paul
Published 1922
Springer Berlin Heidelberg

3
by Michalk, Paul Walter
Published 1922
Springer Berlin Heidelberg

12
by Regenbogen, Otto
Published 1913
Springer Berlin Heidelberg

16
by Kämper, Paul
Published 1924
Springer Berlin Heidelberg

19
by Ellermann, Vilhelm
Published 1918
Springer Berlin Heidelberg