Curso de Código Morse + CD

Presented as a catalogue, the authors provide complete and true information about endangered Mexican Freshwater fishes. A physical and ethological description, the reason of its involvement in the book, preservation state, natural history and ecology, as well as a map with its geographical location in Mexico, and a picture of the specie is provided for each fish. This book is a start point for the knowledge and preservation of the richness of this biological group.

Galaxies have a history. This has become clear from recent sky surveys which have shown that distant galaxies, formed early in the life of the Universe, differ from the nearby ones. New observational windows at ultraviolet, infrared and millimetric wavelengths (provided by ROSAT, IRAM, IUE, IRAS, ISO) have revealed that galaxies contain a wealth of components: very hot gas, atomic hydrogen, molecules, dust, dark matter ... A significant advance is expected due to new instruments (VLT, FIRST, XMM) which will allow one to explore the most distant Universe. Three Euroconferences have been...

Con su copa ancha y redondeada, ha sido durante mucho tiempo, un adorno suntuoso de paseos y plazas en pueblos y ciudades. Diezmado por la grafiosis, ha estado a punto de desaparecer de nuestros paisajes. Una vez expuesta la historia de este árbol y su diversa tipología, se describen en este libro sus enfermedades y tratamientos, sus usos actuales y sus características medicinales

Siembra campesinado: herramientas para el fortalecimiento organizativo está compuesta por una cronología de la lucha campesina, que muestra los principales hitos históricos relacionados con los movimientos sociales campesinos y la legislación agraria durante el último siglo