Effects of wildflower strips in an intensively used arable area on skylarks (Alauda arvensis) [microform] /
Weibel, Urs Matthias.
Eidgenössische Technische Hochschule Zürich.
[Zürich] : Swiss Federal Institute of Technology Zürich,
1999.
"ETH-DISS 13447"--Microfiche header.
Thesis (doctoral)--Swiss Federal Institute of Technology Zürich, 1999.
Includes bibliography.