中国科学技术信息研究所--国家工程技术数字图书馆

colorado state university.(5)

university of california davis.(4)

arizona state university.(2)

oklahoma state university.(2)

utah state university.(2)

auburn university(1)

auburn university.(1)

bidhan chandra krishi viswavidyalaya university (india).(1)

kwara state university (nigeria).(1)

montana state university.(1)

new mexico state university.(1)

north carolina state university.(1)

northeastern university.(1)

oregon state university(1)

portland state university.(1)

purdue university.(1)

royal roads university (canada)(1)

southern university and agricultural and mechanical college.(1)

state university of new york college of environmental science and forestry.(1)

tennessee state university.(1)

the ohio state university.(1)

the university of alabama.(1)

the university of connecticut.(1)

the university of texas - pan american.(1)

the university of texas at arlington.(1)

university of arkansas(1)

university of arkansas.(1)

university of california los angeles.(1)

university of california merced.(1)

university of colorado colorado springs.(1)