1
by Boor, Helmut de, 1891-1976
Published 1998
Book
4
by Boor, Helmut de, 1891-1976
Published 1966
Book
6
by Boor, Helmut de, 1891-1976
Published 1966
Book
14
Published 1959
Other Authors: '; ...Boor, Helmut de, 1891-1976...
Book
15
Published 1965
Other Authors: '; ...Boor, Helmut de, 1891-1976...
Book
16
Published 1965
Other Authors: '; ...Boor, Helmut de, 1891-1976...
Book
17
Other Authors: '; ...Boor, Helmut de, 1891-1976...
Book
18
by Siebs, Theodor, 1862-1941
Published 1961
Other Authors: '; ...Boor, Helmut de, 1891-1976...
Book
19
by Siebs, Theodor, 1862-1941
Published 1969
Other Authors: '; ...Boor, Helmut de, 1891-1976...
Book