Martin Marietta Materials, Inc. is engaged principally in the building materials business, including aggregates, cement, ready mixed concrete and asphalt and paving product lines. The aggregates product line is sold and shipped from a network of more than 270 quarries and distribution facilities in 26 states, Canada, the Bahamas and the Caribbean Islands. The cement, ready mixed concrete and asphalt and paving product lines are located in strategic, vertically integrated markets, predominantly Texas and Colorado. Building materials are used for construction of highways and other infrastructure projects, and in the non-residential and residential construction industries. Aggregates and cement products are also used in the railroad, agricultural, utility and environmental industries. The Company also has a Magnesia Specialties business that manufactures and markets magnesia-based chemical products used in industrial, agricultural, and environmental applications, and dolomitic lime.