TY  - BOOK
TI  - Disk Operating System (DOS) version 3.30: User's Guide 
AV  - QA 76.76.O63 .D611 [ca.1990]
PY  - 1900///
CY  - [S.l.]
PB  - [S.n.]
KW  - PC DOS (Computer file)
KW  - MS-DOS (Computer file)
KW  - Operating systems (Computers)
N1  - IT
ER  -