NEW YORK — National Geographic Society has chronicled scientific expeditions, explorations, archeology, wildlife, and world cultures for more than 100 years, amassing a collection of 11.5 million photos and original illustrations.
A small selection — 240 pieces spanning from the late 1800s to the present — will be sold at Christie’s in December at an auction expected to bring about $3 million, the first time any of the institution’s collection has been sold.
Among the items are some of National Geographic’s most indelible photographs, including that of an Afghan girl during the Soviet invasion of Afghanistan, a portrait of Admiral Robert Peary on his 1908 expedition to the North Pole, a roaring lion in South Africa, and the face of a Papua New Guinea aborigine.
Paintings and illustrations include N.C. Wyeth’s historical scene of sword-fighting pirates, Charles Bittinger’s view of Earth as seen from the moon, and Charles Knight’s depictions of dinosaurs and other prehistoric animals.
They are being auctioned ‘‘to celebrate our legacy . . . and to give people a chance to buy a little part of this great institution’s history,’’ said Maura Mulvihill, senior vice president of National Geographic’s image and video archives.
Proceeds from the Dec. 6 auction, just weeks before National Geographic’s 125th anniversary, will go for the promotion and preservation of the archive and ‘‘the nurturing of young photographers, artists and explorers . . . who are the future of the organization,’’ Mulvihill said.
National Geographic sponsors and funds scientific research and exploration through its official journal, National Geographic Magazine, which reaches 8.8 million people.