[Proceedings] : 29th annual Fertilizer and AG Chemical Dealers Co nference, January 11-12, 1977, Veterans Auditorium, Des Moines, Iowa.
[Proceedings] : 29th annual Fertilizer and AG Chemical Dealers Co nference, January 11-12, 1977, Veterans Auditorium, Des Moines, Iowa.
- Ames : Iowa State University, 1977.
- various pagings : ill. ; 28 cm.
Includes bibliographical references.
Fertilizers -- Congresses.
AF P F 631.8 FER
Includes bibliographical references.
Fertilizers -- Congresses.
AF P F 631.8 FER