TY - BOOK ED - National Science Teachers Association. ED - ebrary, Inc. TI - Dig in!: hands-on soil investigations AV - S591.5 .D54 2001eb U1 - 631.4 21 PY - 2001/// CY - Arlington, Va. PB - NSTA Press KW - Soil science KW - Study and teaching KW - Activity programs KW - Soils KW - Electronic books KW - local N1 - "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 UR - http://site.ebrary.com/lib/rucke/Doc?id=10240819 ER -