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- National Geographic. Vol. 234, no. 1, 2018 Washington, D.C. : National Geographic Society, 2018 . ISSN 0027-9358
- National Geographic. Vol. 234, no. 3, 2018 Washington, D.C. : National Geographic Society, 2018 . ISSN 0027-9358
- National Geographic. Vol. 234, no. 6, 2018 Washington, D.C. : National Geographic Society, 2018 . ISSN 0027-9358
- National Geographic. Vol. 234, no. 4, 2018 Washington, D.C. : National Geographic Society, 2018 . ISSN 0027-9358
- National Geographic. Vol. 234, no. 2, 2018 Washington, D.C. : National Geographic Society, 2018 . ISSN 0027-9358
- National Geographic. Vol. 234, no. 5, 2018 Washington, D.C. : National Geographic Society, 2018 . ISSN 0027-9358