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Dictionary of Agricultural and Environmental Science
S411 .T76 2003

Dictionary of Agriculture from Abaca to Zoonosis
A practical, easy-to-use guide to thousands of terms associated with agriculture.
S411 .L55 1995
Also available online

Encyclopedia of Agricultural Science
S411 .E713 1994
Compilation of short articles by noted agricultural scientists covering all areas of agriculture, including animal science.

Center for Research Libraries: Agriculture Topic Guide provides a wealth of historic agriculture information.  OSUL is a member of the Center so materials are available to you (on request via interlibrary loan if not digitally).  This is for researchers interested in the history of agriculture and agricultural education worldwide.