Sylvia warblers / Hadoram Shirihai, Gabriel Gargallo, and Andreas J. Helbig ; illustrated by Alan Harris ; photographic editor and field photographer, David Cottridge ; distribution maps by C.S. Roselaar ; edited by Guy M. Kirwan and Lars Svensson.
Sylvia warblers / Hadoram Shirihai, Gabriel Gargallo, and Andreas J. Helbig ; illustrated by Alan Harris ; photographic editor and field photographer, David Cottridge ; distribution maps by C.S. Roselaar ; edited by Guy M. Kirwan and Lars Svensson.