A new species of steamer-duck (Tachyeres) from ArgentinaPhilip S. Humphrey · First published 1981Open the Tome
The anatomy of the Labrador duckPhilip S. Humphrey, Robert Stearns Butsch · First published 1958Open the Tome
The Anatomy of the Labrador Duck, Camptorhynchus Labrador (GMELIN)Philip S. Humphrey · First published 1958Open the Tome
The anatomy of the Labrador duck, Camptorhynchus labradorius (gmelin)Philip S. Humphrey · First published 1958Open the Tome
