000 00386nam a22001697a 4500
015 _a1392
080 _a6.058
_bEXP
110 _aU.S.D.I.
245 _aExperiment by schools, radio and government
260 _aU.S.D.I
300 _a80p.
_bFig.
852 _a1R3-2
999 _c752
_d752