Naturwissenschaftliche Zeitschrift für Forst- und Landwirtschaft
- 1.1903 Michigan-USA* = Google, Penn State-USA* = Google
- 2.1904 Michigan-USA* = Google, Penn State-USA* = Google
- 3.1905 Michigan-USA* = Google, Penn State-USA* = Google
- 4.1906 Michigan-USA* = Google, Penn State-USA* = Google
- 5.1907 Michigan-USA* = Google, Penn State-USA* = Google
- 6.1908 Michigan-USA* = Google, Penn State-USA* = Google, California-USA* = Google (6+7), Harvard-USA* = Google, Harvard-USA* = Google
- 7.1909 Michigan-USA* = Google, Penn State-USA* = Google, California-USA* = Google (6+7)
- 8.1910 Michigan-USA* = Google, Penn State-USA* = Google, California-USA* = Google (8+9)
- 9.1911 Michigan-USA* = Google, Penn State-USA* = Google, California-USA* = Google (8+9)
- 10.1912 Michigan-USA* = Google, Penn State-USA* = Google, California-USA* = Google (10+11)
- 11.1913 Penn State-USA* = Google-USA*, California-USA* = Google (10+11), Google-USA* (Stanford) (11)
- 12.1914 Michigan-USA* = Google-USA*, Penn State-USA* = Google-USA*, California-USA* = Google-USA* (12+13)
- 13.1915 Michigan-USA* = Google-USA*, Penn State-USA* = Google-USA*, California-USA* = Google-USA* (12+13), Michigan State-USA* = Google-USA* (13+14)
- 14.1916 Michigan-USA* = Google-USA*, Penn State-USA* = Google-USA*, California-USA* = Google-USA* (14), Google-USA* (Stanford) (14+15), Michigan State-USA* = Google-USA* (13+14)
- 15.1917 Michigan-USA* = Google-USA*, California-USA* = Google-USA* (15+16), Google-USA* (Stanford) (14+15)
- H. 2-12 Penn State-USA* = Google-USA*
- 16.1918 Michigan-USA* = Google-USA*, California-USA* = Google-USA* (15+16), Google-USA* (Stanford) (16+17)
- 17.1919 Michigan-USA* = Google-USA* (17+18), California-USA* = Google-USA* (17+18) Google-USA* (Stanford) (16+17), Minnesota-USA* = Google-USA* (17)
- 18.1920 Michigan-USA* = Google-USA* (17+18), California-USA* = Google-USA* (17+18), Google-USA* (Stanford)