00536nam a2200169Ia 450000500170000000800460001703700290006304000210009204100130011308400240012624500550015024500550020526000600026030000130032036500140033365000190034720250508153424.0008  250505s9999    xx            000 0 eng d  aBooks to be hide in OPAC  aFEDL bengcFEDL  aeng2eng  a016.0014, UNIqFEDL 0aCooperative research projects fiscal 1957 and 1959 0cU. S. Department of Health, Education, and Welfare  aWashington, USAbU.S. Government Printing Office c1960  avii,64p.  aUSDb0.25  aBibliographies