Shelley Smith and Richard Brook are archaeologists actively involved in the development of teaching materials for the Department of the Interior's Bureau of Land Management's Heritage Education Program. Mary Tisdale is the chief of the BLM's Office of Environmental Education and Volunteers. Shelly Fischman, who completed all artwork and associated research, is a BLM illustrator.

Acknowledgements
The authors would like to express their appreciation and thanks to their colleagues in BLM for their assistance in preparing this article: Ken Berg, Kniffy Hamilton, Megg Heath, Mark Hilliard, Earl Hindley, Larry Maxfield, Marilyn Nickels, Jerry Sintz, and Chris Wood; and the staff at the U.S. Department of the Interior Library. The Anasazi wood depletion activity was developed by Jeanne Moe and Kelly Letts of the BLM Utah State Office. The historic photograph of the town of Grafton and the Virgin River was taken by W.T. Lee, and is provided courtesy of the U.S. Geological Survey, Denver, Colorado. The modern counterpart of this historic photograph was taken by Earl Hindley of the BLM Utah State Office.

Primary References
Aldridge, B.G., Aiuto, R., Ballinger, J., Barefoot, A., Crow, L., Feather, Jr., R., Kaskel, A., Kramer, C., Ortleb, E., Snyder, S., Zitzewitz, P. (1993) Science interactions. Columbus, OH: Macmillan/McGraw Hill.

Chesapeake Bay Program. (1994). Our Abundant Chesapeake (article and foldout). Science and Children, 31(8), 26-28,50.

Hessler, E. (1989). Biological diversity makes a world of difference (a curriculum for teachers and interpreters). Columbus, OH: Ohio State University.

Western Regional Environmental Education Council. (1992). Aquatic Project Wild.

Western Regional Environmental Education Council. (1992). Project Wild.

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