I think this view helps us understand better the events in mundane astrology because we can place them in different phases of cycles. In this way we can see what is the past and what is the future of a certain type of event. Let's see a quotation:

"Cycles are described as the means by which the enfolded, infinite and eternal potentiality of all ideas is unfolded in the dimension of Time. [...] Indeed, if time were not in some way related to eternity, and both to the idea of cycles, the very act of attempting to make astrological forecasts would be illusory. [...] Correctly read, the chart for the beginning of any cycle contains within it all that will subsequently unfold in time."

In the second part of the chapter The Planetary Cycles and their Interpretation one can find the interpretations for the major astrological cycles Neptune - Pluto (492 years), Uranus - Neptune (172 years), Uranus - Pluto (127 years), Saturn - Uranus (45 years), Saturn - Neptune (36 years), Saturn - Pluto (33 years), Jupiter - Saturn (20 years), Jupiter - Uranus (14 years), Jupiter - Neptune (13 years), Jupiter - Pluto (12 years), for some little cycles like Sun - Jupiter, Sun - Saturn and, also, a detailed example of cycles in mundane astrology in an analyze of the assassination of J. F. Kennedy. In conclusion, I can say that is a very well written chapter with plenty of valuable information that will satisfy even the most critical reader.  

In Chapter 7 - The Planets and Chapter 8 - The Houses and Signs the authors presents shortly (20 pages) the signification of planets, houses and signs in mundane astrology. It is something like:

"Pluto represents all things which are hidden and secretive in a society. Perhaps we could say that it rules the shadow of the collective. From the trivial level of sewerage workers, pot holers and archeologists, we can move to the more sinister level of secret police, organized crime, and all self-destructive impulses. It rules what Jung called psychotic outbreaks in the collective unconscious."

Part 3 - The Techniques

In Chapter 9 - Ingresses, Lunations, Eclipses, Charles Harvey states very clear that ingresses and lunations give weak results in mundane astrology. He quotes Charles Carter and Andre Barbault, two of the most important mundane astrologers, which have the same opinion. On the other side, eclipses and the natal charts are instruments much more reliable for predictions and seem to give better results. I believe this is an interesting classification which should be remembered by astrologers. 

Chapter 10 - Where on Earth: Astrocartography

In this chapter Charles Harvey presents some techniques used in mundane astrology to find the place where the events will happen. The first one, Astrocartography (ACG), shows the places where a planet is on angles (ASC, MC, DESC, IC) and is pretty easy to use with a computer software. Like with ingresses and lunations, the author warns us not to expect very good results, because it is not so simple as it seems. Sometimes the prediction pass, sometimes not. We should use more techniques to find a reliable prediction.

The second method (Chapter 11) proposed by the author is to find the earth areas which correspond to every zodiacal sign. The principle "as above, as below" implies that every zodiacal degree should have a precise geographically pair on earth, so a planet at 10 degrees in Libra, for example, will be felt in the corresponding place. The main systems of this kind, produced by astrologers in time, are: the Ptolomaic Allocations, de Boulainviller's World Zodiac, Sepharial's Geodetic Equivalents, the Hamburg School Friedrich/Grimm method, Johndro's locality angles, the Great Pyramid Base Line of Williams, Hans Andersen, Ritter's Cosmogeography, the Time System of Wise, Hitschler's method.

The third method (Chapter 12) is to use the charts of towns, but there is one big problem: for the most of cities we don't know the time of creation, the natal chart. The solution, a compromise used by astrologers, is to study many important events from the town's history and to identify some important degrees in the zodiac which give results. The author gives examples of such sensitive degrees where probably are important points from the natal chart: Frankfurt - 4 Virgo/Pisces, 21 Leo/Aquarius, Bristol - 15 Taurus, 26 Leo and Vienna - 13-14 Cancer, 10-11 Libra. The conclusion of this chapter is that it's difficult. It is difficult to find the place where a specific event will happen. But, this is normal. Only a innocent child would believe that it's easy.