00311nam a2200097Ia 4500008004100000082001600041100003300057245007000090260004600160300000700206140113s9999    xx            000 0 und d  a373.68   K9  aNational Academy of Sciences  aUndergraduate Education in the Plant & Soil Sciences -Proceedings  a1969bNational Academy of SciencecU.S.A.  a47