00459nam a2200181 4500 20150602150838.0 000 000 UOEL QA76.55 .L43 1969 Lefkovitz, David File structures for on - line systems / David Lefkovitz New York ; Spartan Books , c1968. 215 p. : ill. Includes index File structures Mathematics lcc LL 9324 9324 0 0 lcc 0 0 UOE UOE GEN 2015-06-02 0 QA76.55 .L43 1969 30002019 2026-04-27 11:53:55 30002019 2015-06-02 LL