1
Published 1843
Electronic
5
Published 1884
Book
7
by Esser, Gerhard 1860-1923
Published 1905
Book
8
by Ritter, Constantin 1859-1936
Published 1919
Book
9
by Ritter, Constantin 1859-1936
Published 1919
Book
10
Published 1928
Book
11
Published 1928
Book
12
Electronic