Deletion of George Washington's Socks

Comment: It was tough finding sources for a book that was published back in 1991, but I've found enough to show that it was/is still pretty heavily used in classrooms. I found a few reviews as well. Also, while I know that  is not a valid argument for either keeping or deleting a page, I do have to say that most of my Ghits were mostly educational: either teaching tools for teachers or classrooms like http://mrsdongell.edublogs.org/2012/05/28/george-washingtons-socks-by-elvira-woodruff/ this one and http://www.dailyrepublic.com/news/education-news/students-battle-in-suisun-using-book-knowledge/ this one using it as part of their curriculum. It's a weak keep for the most part and if anyone wants to create a page for the series itself I'd argue that this could redirect to the main series page, but for right now it's a keep
Stance: keep
Cited policy: Wikipedia:Arguments to avoid in deletion discussions (WP:GHITS)