The historical relationship between energy-consumption and gross national product in the United States

Includes bibliography

Investigation upon the environmental impact and possibilities for development of tourist activities in the Tayrona National Park, Department of Magdalena, Colombia

Revisa las posibilidades y limitaciones para el desarrollo de actividades turisticas en areas de reservas naturales en general, y especificamente en el parque nacional Tayrona, ubicado en la Costa Norte de Colombia.

Road maps towards an information society in Latin America and the Caribbean

Includes bibliography