中国科学技术信息研究所--国家工程技术数字图书馆

university of california los angeles.(25)

the university of wisconsin - madison.(20)

the university of north carolina at chapel hill.(16)

rutgers the state university of new jersey - new brunswick.(15)

university of illinois at urbana-champaign.(15)

university of minnesota.(15)

arizona state university.(14)

harvard university.(14)

university of michigan.(14)

university of toronto (canada).(14)

columbia university.(13)

the pennsylvania state university.(13)

university of washington.(13)

northwestern university.(12)

the university of iowa.(12)

michigan state university.(11)

university of california berkeley.(10)

california institute of integral studies.(9)

city university of new york.(9)

indiana university.(9)

state university of new york at binghamton.(9)

university of south carolina.(9)

university of southern california.(9)

georgetown university.(8)

loyola university chicago.(8)

the ohio state university.(8)

university of california berkeley(8)

university of california irvine.(8)

university of california santa barbara.(8)

university of colorado at boulder.(8)