000 00269nam a2200097Ia 4500
008 220729s1980 xx 000 0 und d
041 _aeng
100 _aEverett.J
245 _aTwin pregnancy and labor[ obtw-24 slides ]
260 _aLondon
_bInstitute of Child Care
_c1980
999 _c128703
_d128703