The image files are of Corona DOS 2.11 (date unknown) and Corona PC Tutor (April 4th 1984).  While I've provided their files in the .zip archives, these are proper bootable 320K disk image files and should be treated and written as such.

Trivia:  
  - The licensed version of PC TUTOR that came with a Corona PC has portions that were created in late 1982.  It can only run from drive A:, so if you want to run it from its files in a subdirectory, you'll have to use SUBST A: xxx where xxx is the directory it is located, then A:, then PCTUTOR.
  - These were on failing disks that took a total of 3 hours and careful management to recover!  You're welcome!

--Trixter 20190624