I don't know. Here in Alabama dolomitic limestone is easy to find in 50 lb bags anywhere at any garden center. Most of our native soil in this state is hard acidic clay.
However in some parts of the USA, limestone may not be easy to find, because some regions have naturally high pH soil, so there is no need for any liming. When native soil pH is over 7.0, many folks use calcium sulfate products (gypsum) in their composting techniques.
Happy Gardening!
_________________ The entire Kingdom of God can be totally explained as an Organic Garden (Mark 4:26)
William Cureton
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