The Virtual Bird, reference

Reference books used here are:

A guide to field identification, Birds of
North America (Robbins, Bruun and Zim)

A field guide to the birds of Britain and
Europe (Peterson, Mountfort and Hollom)
- Finnish translation.

The Illustrated Encylopedia of Birds
- The Definitive Guide to the Birds of
the World (Perrins) - Finnish translation.

Howard&Moore list - available also as
MS Access database or as a text file.