"Papers based on a symposium ... held between 10 and 11 April, 1980 at the Emulsion Polymers Institute, Lehigh University, Bethlehem, Pennsylvania, US...
"Papers based on a symposium ... held between 10 and 11 April, 1980 at the Emulsion Polymers Institute, Lehigh University, Bethlehem, Pennsylvania, USA"--P. opp. t.p.