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How to Carve Marble, Limestone, Soapstone, Alabaster
This is a very informative site, created by stone sculptor, Shane Smith. Great photo examples, information on how to carve, and where to get supplies.
Tech4Learning
Pics4 Learning: Images for Education: Carving
Dozens of useful photos of various carvings from around the world! A useful reference in an art or history class. Browse through the examples, then click to enlarge.