Forstarchiv
- 1.1925 - 77-78 (2006-07) Hathitrust
- 1.1925 Cornell-USA* = Google-USA* = Internet Archive (1+2), Michigan-USA* = Google-USA* = Internet Archive (1+2)
- 2.1926 Cornell-USA* = Google-USA* = Internet Archive (1+2), Michigan-USA* = Google-USA* = Internet Archive (1+2)
- 3.1927 Cornell-USA* = Google-USA* = Internet Archive (3+4), Michigan-USA* = Google-USA* = Internet Archive
- 4.1928 Cornell-USA* = Google-USA* = Internet Archive (3+4), Michigan-USA* = Google-USA* = Internet Archive
- 5.1929 Cornell-USA* = Google-USA* = Internet Archive (5+6), Michigan-USA* = Google-USA* = Internet Archive
- 6.1930 Cornell-USA* = Google-USA* = Internet Archive (5+6), Michigan-USA* = Google-USA*
- der Jahrgang 1931 wird in den USA 2027 gemeinfrei, die nachfolgenden Jahrgänge jeweils 1 Jahr später. 1944 folgt als letzter Jahrgang 2040.
- 7.1931 Cornell-USA* = Google-USA* (7+8), Michigan-USA* = Google-USA*
- 8.1932 Cornell-USA* = Google-USA* (7+8), Michigan-USA* = Google-USA*
- 9.1933 Cornell-USA* = Google-USA* (9+10), Michigan-USA* = Google-USA*
- 10.1934 Cornell-USA* = Google-USA* (9+10), Michigan-USA* = Google-USA*
- 11.1935 Cornell-USA* = Google-USA* (11+12), Michigan-USA* = Google-USA*
- 12.1936 Cornell-USA* = Google-USA* (11+12), Michigan-USA* = Google-USA*
- 13.1937 Cornell-USA* = Google-USA* (13+14), Michigan-USA* = Google-USA*
- 14.1938 Cornell-USA* = Google-USA* (13+14), Michigan-USA* = Google-USA*
- 15.1939 Cornell-USA* = Google-USA* (15+16), Michigan-USA* = Google-USA*
- 16.1940 Cornell-USA* = Google-USA* (15+16), Michigan-USA* = Google-USA*
- 17.1941 Cornell-USA* = Google-USA*, Michigan-USA* = Google-USA*
- 18.1942 Cornell-USA* = Google-USA* (18+19, Nr. 1-8), Michigan-USA* = Google (18+19)
- 19.1943 Michigan-USA* = Google-USA* (19+20)
- 19.1943, no 1-8 Cornell-USA* = Google-USA*
- 19.1943, no. 9-12 Cornell-USA* = Google-USA*
- 20.1944 Cornell-USA* = Google-USA*, Michigan-USA* = Google-USA*