000 00287nam a2200121Ia 4500
008 221001s1965 xx 000 0 eng d
082 _a515.33 RAY
100 _aRay, M.
245 0 _aDifferential calculus
260 _aAgra
_bStudents' Friends
_c1965
300 _a188p.
942 _2ddc
_cBK
999 _c1343
_d1343