000			00360nam a2200157Ia 4500
008			170519s9999 xx 000 0 und d
041			_aEnglish
082			_a517.3/GOE/DIF
100			_aB,S. GOEL
245			_aDIFFERENCE CALCULUS
260			_bPRAGATI PRAKASHAN _aKOLKATA
300			_c116P
650			_aCALCULUS
650			_aMATHEMATICS
942			_cBK
999			_c99198 _d99198