I'm not too familar with Usborne books because I only have three usborne books. I purchased this book at a homeschool convention. It was marked down in price. I was and am still very impressed at the amount of information it contains. Admittedly it is for older kids probably more for Jr high and high school. I might try a study of it when my son is in 6th but I'll have to see. I have read quite a bit of it myself and it seems very thorough.
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