Naturwissenschaftliche Zeitschrift für Land- und Forstwirtschaft

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