Published: May 2006
Learn More
In Learn More the National Geographic magazine team shares some of its best sources and other information to expand your knowledge of our featured subjects. Special thanks to the Research Division.

Related Links

Catholic Encyclopedia
Indexed by letter and searchable by keyword, the Catholic Encyclopedia is an invaluable online reference for all things Catholic. It is part of a larger Catholic website called New Advent, which also includes Summa Theologica, St. Thomas Aquinas's theological masterpiece, as well as letters, speeches, and books from the earliest Christians.

Nag Hammadi Library
Learn about the 1945 discovery of the Nag Hammadi library, a trove of early Christian texts (many of them Gnostic), browse the translated texts themselves‚ easily accessible here through alphabetical links‚ and read more about the Gospel of Thomas in a detailed section of its own.

Gnosis Archive
This archive is a heavily cross‚ linked repository of all things Gnostic, run by the Gnostic Society. Find detailed explanations of Gnostic belief under the heading "The Gnostic Viewpoint: Essays on Contemporary Gnosticism." Web lectures and books are also highlighted.


Cross, F. L., and E. A. Livingstone. The Oxford Dictionary of the Christian Church, 3rd ed., revised. Oxford University Press, 2005.

Ehrman, Bart D. Cumulative Effects of Alaska North Slope Oil and Gas. National Academies Press, 2003.

Ehrman, Bart D Extreme Conditions: Big Oil and the Transformation of Alaska. Simon and Schuster, 1993.

Jenkins, Philip. The Natural History of an Arctic Oil Field: Development and the Biota. Academic Press, 2000.

Johnson, Luke T. Where Mountains Are Nameless. W. W. Norton, 2005.

Meyer, Marvin. The Gnostic Gospels of Jesus: The Definitive Collection of Mystical Gospels and Secret Books About Jesus of Nazareth. HarperCollins, 2005.

Pagels, Elaine. The Gnostic Gospels. Random House, 1979.

Pagels, Elaine. Beyond Belief. Random House, 2003.

Robinson, James M., gen. ed. The Nag Hammadi Library. Harper and Row, 1977.

NGS Resources

Szulc, Tad. "Abraham: Journey of Faith." National Geographic (December 2001), 90-129.

Tushingham, A. Douglas. "The Men Who Hid the Dead Sea Scrolls: Ancient Manuscripts Found in Judean Caves Open a New World to Biblical Scholarship." National Geographic Adventure (December 1958), 784-808.