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.

"... very well translated... Cardenal merits praise for presenting, on such an ambitious scale, a passionate alternative history of the Spanish encounter with Central America." --Booklist "Combining hsitory with poetry, Cardenal exposes the violence, treachery, injustice, and exploitation that are so much a part of Central America and Mexico's] past and present." --World Literature Today "Explore this dense, beautiful poem and you will be rewarded with riches that 'delight and hurt not'." --Nicaragua Update "... a remarkable text.... El estrecho dudoso is a masterful and compelling poetic account of early colonial Central America, and the translation is likewise masterful." --Colonial Latin American Historical Review In this book-length poem, Nicaraguan priest and revolutionary Ernesto Cardenal tells the story of the Spanish conquest of Central America from the "discovery" of the American continent to recent historical events. A remarkable achievement and an engrossing narrative, the poem is published here in both Spanish and English.