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 berkeley.(18)

university of washington.(15)

state university of new york at buffalo.(14)

university of california davis.(10)

university of california los angeles.(10)

university of colorado at boulder.(9)

stanford university.(8)

california institute of technology.(6)

university of california irvine.(5)

university of california san diego.(5)

university of illinois at urbana-champaign.(5)

the george washington university.(4)

university of toronto (canada).(4)

lehigh university.(3)

north carolina state university.(3)

purdue university.(3)

state university of new york at buffalo(3)

the university of texas at austin.(3)

the university of utah.(3)

university of california berkeley(3)

university of new hampshire.(3)

kansas state university.(2)

rensselaer polytechnic institute.(2)

rice university.(2)

the catholic university of america.(2)

university of arkansas.(2)

university of california davis(2)

university of nevada reno.(2)

university of puerto rico mayaguez (puerto rico).(2)

virginia polytechnic institute and state university.(2)