- Microsoft MS-DOS 3.20 (pcjs.com)
The MS-DOS 3.20 disks in the PCjs collection are the only known non-OEM copies of that release available online. All other known MS-DOS 3.20 disk images are OEM releases (eg, HP, Zenith, Data General, Seiko Epson, etc.) and can be found on sites like WinWorld.
- Early Cretaceous (Wikipedia)
The Early Cretaceous (geochronological name) or the Lower Cretaceous (chronostratigraphic name) is the earlier or lower of the two major divisions of the Cretaceous. It is usually considered to stretch from 145 Ma to 100.5 Ma.