Stone

• National Stone, Sand, and Gravel Association (http://www.aggregates.org)
• PACA - Pennsylvania Aggregate and Concrete Association (http://www.pacaweb.org)
• Mineral Information Institute (http://www.mii.org)
• US Geologic Survey (http://www.usgs.gov)
• International Center for Aggregates Research (ICAR) (http://civil.ce.utexas.edu/org/icar/icar.htm)
• Pennsylvania Department of Transportation (http://www.dot.state.pa.us)

Agricultural Limestone

• @griculture Online (http://www.agriculture.com)
• Penn State Agronomy Guide (http://AgGuide.agronomy.psu.edu/)
• Penn State Agronomy Dept. home page (http://www.agronomy.psu.edu)
• Penn State College of Agricultural Sciences links page (http://www.cas.psu.edu/links.htm)
• Potash & Phosphate Institute (http://www.ppi-far.org)
• Successful Farming Magazine (http://www.agriculture.com/sfonline/index.html)

Other Links

• Diamond-Tex (http://www.diamondtex.com)
• Burkholder Paving (http://www.burkholderpaving.com)
• New Holland Concrete (http://www.newhollandconcrete.com)
• Narvon Minerals (http://www.narvonminerals.com)
• New Enterprise Stone & Lime Company, Inc. (http://www.nesl.com)
• Mine Safety and Health Administration (MSHA) (http://www.msha.gov)
• Lancaster Chamber of Commerce and Industry (http://www.lcci.com)