A very nitpicky thing to complain about but the description of the Harvester has a few typos.
It says "Economy unit; move to a Generator to increase its base income by 15 Multiple Harvesters can enhance a region" while it should say
"Economy unit; move to a Generator to increase it's base income by 15%. Multiple Harvesters can enhance a region"
It's not really a big deal at all, it'd just make the description a bit nicer to read.