Mexico D. F. SEP, 1997. Paperback. 252p., profusely illustrated in the text with photos, drawings, maps and tables, all reproduced in color (rather fuzzily), softbound in 10x7 inch color-photo wraps; later printing of the second edition. A former owner has protected this item in clear plastic wrap, neatly enough, and secured it with bits of scotch tape inside each cover. A clean sound copy with a little wear and tear to the onlay, which could be removed easily. Text in Spanish.
FYI, designed as a primary school textbook to be given out free: "Distribucion gratuita - prohibida su venta;" all together 38,000 copies printed, currently none available on the net.