The understanding that some pesticides are more hazardous than others is well established. Recognition of this is reflected by the World Health Organization (WHO) Recommended Classification of Pesticides by Hazard, which was first published in 1975. The document classifies pesticides in one of five hazard classes according to their acute toxicity. In 2002, the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) was introduced, which in addition to acute toxicity also provides classification of chemicals according to their chronic health hazards and environmental hazards.

A Frequency Dictionary of Spanish has been fully revised and updated, including over 500 new entries, making it an invaluable resource for students of Spanish. Based on a new web-based corpus containing more than 2 billion words collected from 21 Spanish-speaking countries, the second edition of A Frequency Dictionary of Spanish provides the most expansive and up-to-date guidelines on Spanish vocabulary. Each entry is accompanied with an illustrative example and full English translation. The Dictionary provides a rich resource for language teaching and curriculum design, while a separate CD version provides the full text in a tab-delimited format ideally suited for use by corpus and computational linguistics. With entries arranged both by frequency and alphabetically, A Frequency Dictionary of Spanish enables students of all levels to get the most out of their study of vocabulary in an engaging and efficient way.

Mixed race studies is one of the fastest growing, as well as one of the most important and controversial areas in the field of race and ethnic relations. Bringing together pioneering and controversial scholarship from both the social and the biological sciences, as well as the humanities, this reader charts the evolution of debates on 'race' and 'mixed race' from the nineteenth to the twenty-first century. The book is divided into three main sections: tracing the origins: miscegenation, moral degeneracy and genetics mapping contemporary and foundational discourses: 'mixed race', identities politics, and celebration debating definitions: multiraciality, census categories and critiques. This collection adds a new dimension to the growing body of literature on the topic and provides a comprehensive history of the origins and directions of 'mixed race' research as an intellectual movement. For students of anthropology, race and ethnicity, it is an invaluable resource for examining the complexities and paradoxes of 'racial' thinking across space, time and disciplines.