中国科学技术信息研究所--国家工程技术数字图书馆

university of oregon.(15)

arizona state university.(14)

michigan state university.(11)

tufts university.(9)

university of washington.(8)

university of minnesota.(7)

city university of new york.(6)

the university of arizona.(6)

the university of north carolina at chapel hill.(6)

university of delaware.(6)

university of michigan.(6)

university of toronto (canada).(6)

state university of new york college of environmental science and forestry.(5)

the university of wisconsin - madison.(5)

the university of wisconsin - milwaukee.(5)

university of california berkeley.(5)

university of california irvine.(5)

university of south florida.(5)

university of southern california.(5)

northeastern university.(4)

texas southern university.(4)

university of california davis.(4)

university of california los angeles(4)

university of colorado at denver.(4)

university of north texas.(4)

university of washington(4)

washington state university.(4)

yale university.(4)

college of charleston.(3)

harvard university.(3)