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- 81051630 contributor B3974784.
- 81051630 created "c1981.".
- 81051630 date "1981".
- 81051630 date "c1981.".
- 81051630 dateCopyrighted "c1981.".
- 81051630 extent "372 p. :".
- 81051630 identifier "0894350463 (pbk.)".
- 81051630 issued "1981".
- 81051630 issued "c1981.".
- 81051630 language "eng".
- 81051630 publisher "Wellesley, MA. : Q.E.D. Information Sciences,".
- 81051630 subject "001.64/25/0288 19".
- 81051630 subject "QA76.9.S65 P47 1981".
- 81051630 subject "Software maintenance.".
- 81051630 title "Managing systems maintenance / William E. Perry.".
- 81051630 type "text".