A price guide of over 630 base metal Roman coins dated 241 BC - 498 AD, with their market values, notes on changes in the coinage over the years and over 640 drawings to aid identification.[...]
A valuable new reference on insect behavior, this exceptional new text delves into the primary sensory communication system used by most insects -- their sense of smell. This important text covers how insects produce pheromones and how they detect pheromones and plant volatiles. Since insects rely o[...]