Three kinds of rock.
Contributors: Washington State University. Cooperative Extension Service.
Series: Extension mimeo -- 2881.; Extension mimeo (Washington State University. Cooperative Extension) -- 2881.
Publisher: Cooperative Extension Service, College of Agriculture, Washington State University
Published: 1970
Place of publication: Pullman
Language: eng
Number of pages: 11
Notes: Cover title.

"Washington 4-H Natural Resources Project."

"April 1970."

"EM 2881."