Researching water quality :
January 1989 - July 1993 /
Bonnie Emmert and Joe Makuch.

APA Citation

Emmert, B., Makuch, J., National Agricultural Library (U.S.). (1993). Researching water quality: January 1989 - July 1993. Beltsville, Md.: National Agricultural Library.

MLA Citation

Emmert, Bonnie, Joe Makuch, and National Agricultural Library (U.S.). Researching Water Quality: January 1989 - July 1993. Beltsville, Md.: National Agricultural Library, 1993.

Warning: These citations may not always be complete (especially for serials).