TY  - BOOK
AU  - Duffy,Tim
TI  - Four software tools
SN  - 0534092195
PY  - 1990///
CY  - Belmont, Ca.
PB  - Wadsworth Publishing Co.
KW  - PC DOS (Computer operating system)
KW  - MS-DOS (Computer operating system)
KW  - dBase III Plus (Computer program)
ER  -