中国科学技术信息研究所--国家工程技术数字图书馆

university of toronto (canada).(2,914)

university of michigan.(2,824)

university of california los angeles.(2,607)

university of california berkeley.(2,516)

university of minnesota.(2,484)

the university of wisconsin - madison.(2,435)

university of washington.(2,363)

purdue university.(2,233)

arizona state university.(2,184)

harvard university.(2,176)

michigan state university.(2,000)

university of illinois at urbana-champaign.(1,914)

iowa state university.(1,842)

stanford university.(1,760)

the pennsylvania state university.(1,698)

university of maryland college park.(1,691)

university of california davis.(1,665)

the university of arizona.(1,659)

the ohio state university.(1,637)

columbia university.(1,608)

northwestern university.(1,542)

walden university.(1,516)

university of california san diego.(1,501)

north carolina state university.(1,491)

the university of north carolina at chapel hill.(1,456)

university of colorado at boulder.(1,454)

state university of new york at buffalo.(1,431)

princeton university.(1,421)

university of southern california.(1,351)

texas a&m university.(1,295)