Birds of British Columbia and the Pacific NorthwestRichard Cannings, Tom Aversa, Hal Opperman · First published 2016Open the Tome
Birds of the Pacific NorthwestTom Aversa, Richard Cannings, Hal Opperman · First published 2016Open the Tome
Birds of Southwestern British ColumbiaRichard Cannings, Tom Aversa, Hal Opperman · First published 2005Open the Tome
Birds of the Willamette Valley regionHarry Nehls, Tom Aversa, Hal Opperman · First published 2004Open the Tome
Birds of the Puget Sound RegionBob Morse, Tom Aversa, Hal Opperman · First published 2003Open the Tome
