Frederick K. Lutgens, Edward J. Tarbuck
7th ed.. Prentice-Hall, Inc., 1998
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prepared by the Book Division & National Geographic Maps
The National Geographic Society, 1998
書

by Rick Leslie
Steck-Vaughn, 1998
書

by Andrew Clements
Steck-Vaughn, 1998
書

written by Fergus Fleming, Paul Dowswell ; designed by Karen Tomlins
Usborne, 1998
書