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.(11)

michigan state university.(8)

university of california davis.(8)

colorado state university.(6)

the university of arizona.(5)

university of hawai'i at manoa.(5)

university of rhode island.(5)

northern arizona university.(4)

university of california santa barbara.(4)

university of maryland college park.(4)

university of new hampshire.(4)

university of south florida.(4)

utah state university.(4)

arizona state university.(3)

duke university.(3)

harvard university.(3)

mississippi state university.(3)

royal roads university (canada).(3)

university of california berkeley.(3)

university of california san diego.(3)

university of florida.(3)

walden university.(3)

east carolina university(2)

east carolina university.(2)

iowa state university.(2)

mcgill university (canada).(2)

michigan technological university.(2)

oregon state university.(2)

state university of new york college of environmental science and forestry.(2)

the ohio state university.(2)