Nero, Robert W. The great gray owl : : phantom of the northern forest / [electronic resource] / Robert W. Nero ; photos. by Robert R. Taylor.. — 1st ed.. — Washington, D.C. : : Smithsonian Institution Press,, c1980.. — 167 p. : : ill. ; 26 cm. — (A Smithsonian nature book). - Smithsonian nature book. .