My pal, Shane Grundy, told me about this list that was compiled by ChildrensBooksGuide.com. The list contains what they feel are the best all-time classic pieces of literature for children of all ages. I noticed that many of them have been around for a long time. There is also a link to the top 100 picture books list.
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The URL: http://childrensbooksguide.com/100-best-childrens-chapter-books-of-all-time/
Here is another site to consider:
http://www.pedagonet.com/quickies/mathworksheets.htm