中国科学技术信息研究所--国家工程技术数字图书馆

university of arkansas.(123)

university of california davis.(60)

texas a&m university.(29)

louisiana state university and agricultural & mechanical college.(28)

kansas state university.(14)

mississippi state university.(14)

university of arkansas(13)

university of minnesota.(12)

michigan state university.(11)

cornell university.(10)

purdue university.(9)

the chinese university of hong kong (hong kong).(9)

clemson university.(8)

north carolina state university.(8)

university of delaware.(8)

colorado state university.(7)

iowa state university.(7)

mcgill university (canada).(6)

rice university.(6)

the pennsylvania state university.(6)

university of california davis(6)

university of illinois at urbana-champaign.(6)

university of toronto (canada).(6)

iowa state university(5)

university of hawai'i at manoa.(5)

university of missouri - columbia.(5)

city university of new york.(4)

louisiana state university and agricultural & mechanical college(4)

rutgers the state university of new jersey - new brunswick.(4)

south dakota state university.(4)