Just recently got the Discovery Sourcebook. and the use of the trailing s on years to indicate decades is a problem - in that the headers are set to All Caps. Page 65 has two such:
“VULCAN 2230S”
“UNKNOWN MOON, 2250S”
This is a relatively minor issue… but for folk with dyslexia and/or poor vision, it’s a significant impediment, as the S can appear to be a 3, 5, or 8, and thus a 5th digit, while a lower-case s sets off the pluralizing s very clearly not a digit.