Edit. Lutterworth Press, 1977 London. 4ºm (22,5×14,5cm). 111 págs. Cartoné con sobrecubierta ilustrada. Sobrecubierta deslucida. «Guide to Comets is a highly informative accouunt of those elusive visitors from space which mystified man for many centuries. Past civilizations considered comets to be harbingers of disaster or omens of divine intent; military successes and failures were often attributed to the appearance of a comet over the battlefield. And in 1456 Pope Calixtus III was said to have excommunicated a comet (later charted and name after Edmond Halley) as an agent of the devil!.»