TY  - BOOK
AU  - Duffy Tim
TI  - Four software tools : with wordperfect 5.0/5.1 , Lotus 123 and D base 111 Plus / Tim Duffy
SN  - 0534984991
U1  - 005.36 DUF 
CY  - WADWORTH
KW  - PC DOS (COMPUTER OPERATING SYSTEM)
ER  -