The clearest and sharpest recognition guide to over 500 species of seashells from around the world. Authoritative text, crystal-clear photography, and a systema

Describes a wide variety of shells, including the lion's paw, giant Atlantic cockle, and Katherine's chiton.

Shell has been at the forefront of bitumen technology for over 90 years, and continues to play a leading role in global bitumen research and development. The Sh

"This new edition reflects many of the very significant advances which have taken place in the period since the last edition was published. I am confident that