Descripción
Notas:Title screen viewed on November 13, 2013; available on the Internet in PDF format.
"United Nations publication sales no. E.13.I.5"--Title page verso
Descripción Física:1 online resource (xv, 82 pages) : color illustrations
Bibliografía:Includes bibliographical references.
ISBN:9789210562164
921056216X
9789211012781
9211012783