I've added Lesson 3 to the shared folder on Dropbox:
https://www.dropbox.com/sh/269mvashmwa81no/AACNH6r66fngEZrF9ejwaegsa?dl=0
If you want to download the file, hover your mouse over the file and look for the ellipsis "..." Click there and you'll see the Download option.
Cheers,
Mojo
--
Morris Jones, Monrovia, CA
BridgeMojo
Old Town Sidewalk Astronomers
Mojo's Blog