A hidden treasure
Subtitle: instructional materials for groundwater resource protection.
Contributors: National Vocational Agriculture Teachers Association (U.S.)
Publisher: National FFA Foundation
Published: 1991
Place of publication: Madison, Wis
Language: eng
Subjects: Groundwater -- Study and teaching; Groundwater -- Quality; Groundwater -- Pollution
Notes: Cover title.

"Project of the National Vocational Agriculture Teachers Association."

Includes bibliographical references.

Accompanied by: Worm digest (15 p. : ill. ; 28 cm) and 1-2-3 earthworm composting bin (1 sheet ; 28 cm.) in pocket.