00340nam a22001337a 4500 200220b ||||| |||| 00| 0 eng d 9789380016658 005.43 WAD WALIA, Ekta Operating System Concepts 2nd 2019 New Delhi Khanna Book Publishing Co. (P) Ltd. 8504 8504 0 0 ddc 0 005_430000000000000_WAD 0 BTECHCSE 48951 PIET PIET 2020-02-20 KIRTI PRAKASHAN NEW DELHI IN Rupees 330.00 IN6150 15 005.43 WAD 31687 2026-06-04 15:40:05 2026-05-21 1 240.00 2020-01-23 BK