Environmental impact of ammonia and urea production unitsDonald R. Waggoner, George Hoffmeister · First published 1992Open the Tome
Autonomía, planificación, coordinación, innovacionesAna Herzfeld, Barbara Ashton Waggoner, George R. Waggoner, University of Kansas, Seminar on Higher Education in the Americas (12th 1972) · First published 1972Open the Tome
