Are Pyramids Made Out of Concrete?
Research by Joseph Davidovits suggests that pyramids and temples were constructed using agglomerated limestone, rather than quarries, and hoisted blocks of natural limestone.
http://www.geopolymer.org/science_archaeology/pyramids_egypt/index.html

Meckley's Limestone Products, Inc.
Meckley's Limestone Products - High quality construction limestone, agricultural limestone and bitumious concrete. Greystone Materials - Bridging the gap between the sorbent and power industries.
http://www.meckleys.com/

Martin Limestone
Supplier of limestone, agricultural limestone, baseball and softball infield mix, sand, quartzite stone, and clay. Includes company and product information and links to relevant industry resources.
http://www.martinlimestone.com

Natural Stone Floor Stone Directory
A pictorial resource for all parties interested in using natural stones (marble, granite, slate, limestone and onyx) in their projects.
http://www.naturalstonefloor.com/

Indiana Limestone Institute of America
Serves the construction industry as a coordinating agency for the dissemination of accurate, unbiased information on limestone standards, recommended practices, grades, colors, finishes, and all technical data required for specifying, detailing, fabricating and erecting Indiana Limestone.
http://www.iliai.com

Associated Natural Stones
Associated Natural Stones - Exporter & suppliers of natural stone, building stones, polished stone, marble granite, sandstones, limestone, cobbles, pebbles, quartzites, inlay table tops & stone artifacts from India.
http://www.ansiindia.com

StoneKast
StoneKast crushed limestone bowls add a natural feel to your bathroom. Made entirely from natural materials each bowl is individual.
http://www.stonekast.com/

Marmol Export, U.S.A.
marmol export, usa, experts in marble and natural stone
http://www.marmol.com/

Solnhofen Lithographic Limestone
Information about the paleontology of the formation from the Hooper Virtual Natural History Museum.
http://hoopermuseum.earthsci.carleton.ca//solnhofen/intro.html

Elliott Stone Company
Bloomington, Indiana stone quarry that operates year-round and provides the highest quality limestone for construction purposes.
http://www.elliottstone.com/