Reference

 

 

Britannica Dictionary Question - Age designation by decade?

Book Collections Online (https://onlinebooks.library.upenn.edu/)

College Board SAT and SAT Subject Tests (https://research.collegeboard.org/programs/sat)

Complete English Grammar Rules (.pdf)

Datausa.io has extensive Data Research; search universities (UMCP - datausa.io)

Stanford Encyclopedia of Philosophy (Link)

Vocabulary list (6000 words)