中国科学技术信息研究所--国家工程技术数字图书馆

lehigh university.(11)

georgia institute of technology.(10)

north carolina state university.(9)

university of california berkeley.(8)

university of washington.(8)

university of alberta (canada).(7)

michigan state university.(6)

purdue university.(6)

virginia polytechnic institute and state university.(6)

washington state university.(6)

west virginia university.(6)

drexel university.(5)

missouri university of science and technology.(5)

northeastern university.(5)

the university of texas at austin.(5)

university of michigan.(5)

university of minnesota.(5)

university of toronto (canada).(5)

cornell university.(4)

duke university.(4)

harvard university.(4)

northwestern university.(4)

princeton university.(4)

rutgers the state university of new jersey - new brunswick.(4)

state university of new york at buffalo.(4)

the ohio state university.(4)

the university of akron.(4)

the university of utah.(4)

university of california davis.(4)

university of california santa barbara.(4)