The second edition of The Aggregates Handbook, published by the National Stone, Sand and Gravel Association (NSSGA), is now available, says the Society for Mining, Metallurgy, and Exploration (SME). The organisation says the handbook has been the industry's primary source for aggregates technology and knowledge for more than two decades, and the second edition has been expanded to include developments in sustainability, safety, transportation, design, technology standards and industry trends.