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DOS - Wikipedia
MS-DOS - Wikipedia
The Ultimate, Complete List of MS-DOS Commands - Lifewire
Disk operating system - Wikipedia
MS-DOS | Definition, Features, Importance, & Facts | Britannica
How to run a DOS program in Windows 10 | PCWorld
Microsoft DOS and Windows Command Line - Computer Hope
dos | definition in the Cambridge English Dictionary
Voter Registration Homepage - DOS Voting & Election Information
Pa Department of State