TY  - BOOK
AU  - Russell,Helen Ross
AU  - Strong,Arline
TI  - Soil; a field trip guide
AV  - S591.3 .R88
U1  - 631.4 
PY  - 1972///]
CY  - Boston
PB  - Little, Brown
KW  - Soil science
KW  - Experiments
KW  - Juvenile literature
KW  - Soils
N2  - Simple experiments and observations reveal how rocks, weather, water, plants, animals, and gravity play a part in making soil
UR  - http://www.archive.org/details/soilfieldtripgui00russ
UR  - http://www.openlibrary.org/books/OL4584534M
ER  -