000 00268nam a22001097a 4500
050 _aMED LB1028.5
_bP718
100 _aPocztar, J.
245 _aThe theory and practice of programmed instruction
260 _aParis
_bUNESCO
_c1972
300 _a179p.
_bill.
942 _cBK
999 _c17438
_d17438