HEATKEYS

The Copper Development Association Inc. (CDA) is the market development, engineering and information services arm of the copper industry, chartered to enhance and expand markets for copper and its alloys in North America. CDA's website is an excellen...

Tools and Basic Information for Design, Engineering and Construction of Technical Applications

Sizes of shoes, sheets, mattresses, baseball fields and other objects; grades; indexes (such as body mass index); the metric system and other systems and units of weight, measure and other properties, foreign and domestic, old and new.

ASTM International develops international standards for materials, products, systems and services used in construction, manufacturing and transportation. ASTM standard specifications and test methods define uniform requirements and procedures.