000 00218 a2200097 4500
001 18914
100 _aPiaggio, H T H
245 _aElementary treatise on diff equ
260 _a
_bBell & sons
_c
090 _c14003
_d14003
942 _aNUST-CAE
_cM
_c4452
999 _c253987
_d253987