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.(12)

university of colorado at boulder.(9)

university of michigan.(7)

arizona state university.(6)

the university of arizona.(6)

university of maryland college park.(6)

iowa state university.(5)

tufts university.(5)

university of california davis.(5)

university of california los angeles.(5)

colorado state university.(4)

columbia university.(4)

michigan state university.(4)

northern arizona university.(4)

princeton university.(4)

royal roads university (canada).(4)

the pennsylvania state university.(4)

the university of wisconsin - madison.(4)

university of california santa barbara.(4)

university of minnesota.(4)

american university.(3)

antioch university.(3)

cornell university.(3)

george mason university.(3)

harvard university.(3)

rutgers the state university of new jersey school of graduate studies.(3)

southern illinois university at carbondale.(3)

state university of new york at binghamton.(3)

syracuse university.(3)

the university of north carolina at chapel hill(3)