中国科学技术信息研究所--国家工程技术数字图书馆

university of washington.(71)

the university of wisconsin - madison.(55)

michigan state university.(49)

harvard university.(45)

arizona state university.(43)

the university of texas at arlington.(43)

university of california berkeley.(35)

university of california davis.(35)

university of maryland college park.(35)

university of minnesota.(30)

the university of arizona.(27)

utah state university.(26)

university of california los angeles.(24)

university of colorado at boulder.(24)

university of florida.(24)

university of georgia.(24)

university of michigan.(24)

university of pennsylvania.(24)

the pennsylvania state university.(23)

university of toronto (canada).(22)

columbia university.(21)

northern arizona university.(20)

the university of north carolina at chapel hill.(19)

university of idaho.(19)

university of illinois at urbana-champaign.(19)

texas a&m university.(18)

university of oregon.(18)

university of washington(18)

iowa state university.(17)

rutgers the state university of new jersey - new brunswick.(17)