books.google.com - Much of the world's surface, even under the oceans, is covered in thick deposits of sedimentary particles - gravel, sand, silt and clay. The nature of the deposits and their formation is very much dependent on the distribution of particles of different sizes. However, different instruments measure different...http://books.google.com/books/about/Principles_Methods_and_Application_of_Pa.html?id=jayzqzefqUsC&utm_source=gb-gplus-sharePrinciples, Methods and Application of Particle Size Analysis
