By Fonda, Suzanne, National Geographic Society (U. S.)
By National Geographic Society (U. S.)
By Apt, Jay, Helfert, Michael, Wilkinson, Justin, Ressmeyer, Roger, National Geographic Society (U. S.)
By National Geographic Society (U. S.), Malarkey, Curtis, Segal, Julie, Zook, Cheryl, Herbert, Truly, Errig, Chuck
