Dig in! [electronic resource] : hands-on soil investigations.
Contributor(s): National Science Teachers Association | ebrary, Inc.
Material type:![materialTypeLabel](/opac-tmpl/lib/famfamfam/BK.png)
"NSTA Stock Number: PB159X"--verso of title page.
"Published with support from the Natural Resources Conservation Service, U.S. Department of Agriculture"--title page.
Includes bibliographical references (p. 123-126).
Electronic reproduction. Palo Alto, Calif. : ebrary, 2009. Available via World Wide Web. Access may be limited to ebrary affiliated libraries.
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