"La agricultura ha sido un poderoso factor en la disminución de la eficiencia humana, así como en el avance de la civilización... Prácticamente cada paso de progreso va acompañado de inconvenientes que no se corrigen durante mucho tiempo".
Compact, yet comprehensive, this book contains more than 5,000 full-color illustrations, charts, tables, photographs, and maps, as well as providing generous coverage of Spanish language and culture. With over 90,000 words and 200,000 definitions, this annually revised book serves as a handy reference guide. Full-color illustrations.
Biographies and bibliographies of members are included in many of the volumes. Lists of members are usually given on covers of the numbers.
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