000
00300nam a2200109Ia 4500
008
220421s1969 xx 000 0 und d
041
_a
eng
082
_a
507
_b
RIC/SCI
100
_a
Richardson ,John S.
_9
569836
245
_a
Science teaching in secondary school
260
_a
N.Delhi
_b
N.C.E.R.T.
_c
1969
999
_c
395936
_d
395936