21
Published 1992
Book
22
Published 1990
Book
23
by Betthausen, Peter, 1941-
Published 1990
Book
24
Published 2006
Map
26
by Osborn, Max, 1870-1946
Published 1909
Book
29
30
by Schubring, Paul, 1869-1935
Published 1905
Book
31
Published 1975
Serial
32
Published 1928
Serial
33
by Theihaber, Felix A.
Published 1913
Book
35
Published 1994
Book
36
Published 2006
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Serial
38
Published 1965
Book