279 books • 52 series
America's Hidden Corners (Travel books)
Giants from the Past (World Explorers S.)
Splendours of the Past
Undersea Treasures (Action Pop-up Books)
Alaska (National Geographic special publications)
Books for Young Explorers
Hidden Worlds (Books for World Explorers S.) (Books for World Explorers)
"National Geographic" Book of Mammals
America's Magnificent Mountains
Picture Atlas of Our Fifty States
Animals in Danger (Books for Young Explorers)
Everyday Life in Bible Times (Story of man library)
Song & Garden Birds of North America (Natural Science Library)
Lion Cubs (National Geographic Action Books S.) (Books for Young Explorers)
Atlas of North America