Hello, I just got this book on the English language. It has many interesting references in it and will surely be helpful for writing; especially since I love to write historical work. If a word seems too modern for the setting of my story, I'll look it up. It's divided into sections such as "In Use by 1600."
Here's an example from the book: "One could blab by 1400, blabber by 1470, and be a blab by 1350." Huh, I would have guessed these terms to be newer. I'm going to have fun learning with this book because I love language. :)