The Unknown Soldier

Unknown Woman

Mysteries of the Unknown: Mystic Places (Mysteries of the Unknown)

Prospects Unknown

Destination Los Angeles (Port Cities of North America)

Destination Valdez (Port Cities of North America)

Destination Veracruz (Port Cities of North America)

Throwim Way Leg: Tree-Kangaroos, Possums, and Penis Gourds-On the Track of Unknown Mammals in Wildest New Guinea

Sleep, our unknown life

The Unknown City: Lives of Poor and Working-Class Young Adults