How do I go about building a retaining wall?

I just installed an above ground pool and need 4 feet of level ground around it. After quite a bit of excavating, I have my 4 feet, but I have a round wall of dirt I have to hold back. Is there a way to get this built without breaking my back or my bank account? Thanks!!

Answers:
I just watched a TV show about this, and one of the concerns was that anything over 3 feet is difficult to stabilize. It seems you will need quite a good foundation for the wall, and to make sure that it drains well so that it won't collapse. I would use stone, concrete and re-rod, but as you are seeking an inexpensive solution, I'll just send you a couple of links and let you explore what might be best for you.

I would like to know how a Lorena stove is constructed. I saw a presentation on a website but can't find it.
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