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keyword: non-indigenous organisms – 10 free books.
These books are available in PDF format - good for desktops, printing.
Review of Invertebrate Biological Control Agents Introduced into Europe
Urs Schaffner and Esther Gerber
Proceedings of the 5th International Symposium on Biological Control of Arthropods
Charles Vincent et al.
Guide to the Naturalized and Invasive Plants of Eastern Africa
Arne Witt and Quentin Luke
Review of Invertebrate Biological Control Agents Introduced Into Europe
Esther Gerber and Urs Schaffner
Proceedings of the 5th International Symposium on Biological Control of Arthropods
Charles Vincent et al.
Guide to the Naturalized and Invasive Plants of Eastern Africa
Quentin Luke and Arne Witt
