Originally posted by Mary Rose
It is in an interview of author Peter Tompkins by Atlantis Rising Magazine in Issue #3:

Publication Date: June 1997

The long-awaited follow-up to Peter Tompkins's bestseller THE SECRET LIFE OF PLANTS is an astonishing account of how spiritualists and scientists alike are revealing that the physical world teems with nature spirits. In a dramatic meeting of New Science and New Age, Tompkins's new book is sure to radically transform how readers perceive and treat the natural world around them. Index. 20 photos & drawings.

Originally posted by Mary Rose
At the end of the interview, which evidently was approximately in the year 1997, a book was about to be published which had not yet been named. I think this is probably it:

Amazon's Book Description:

Publication Date: June 1997

The long-awaited follow-up to Peter Tompkins's bestseller THE SECRET LIFE OF PLANTS is an astonishing account of how spiritualists and scientists alike are revealing that the physical world teems with nature spirits. In a dramatic meeting of New Science and New Age, Tompkins's new book is sure to radically transform how readers perceive and treat the natural world around them. Index. 20 photos & drawings.

Of course, the Wikipedia article on The Secret Life of Plants brushes off the book as "pseudoscience." It's not pseudoscience.

. . . The Earth is simply a huge magnet, a dynamo, wound with magnetic lines of force as its coils, tenescopically counted to be 1257 to the square centimeter in one direction, and 1850 to the square centimeter in the other direction (eddy currents). The spectroscope shows that there is an enormous magnetic field around the Sun, and it is the present conclusion of the best minds that magnetic lines of force from the Sun envelop the Earth and extend to the Moon, and that everything, no matter what its form on this planet, exists by reason of magnetic lines of force. This information was published in a book called Behind the Flying Saucers by journalist Frank Scully, in 1950. The unbalanced fields of 1257 lines of force per square centimetre in one direction, and 1850 in the other, ( 400x Pi and 588 x Pi (ME)) does not tell us very much in itself. But if we use the information to calculate the field strength over an area which has a harmonic relationship with the unified fields of space, and if the basic information is correct, we should find some mathematical values of great importance.

. . . It appears now that the magnetic field strengths and areas change in conjunction with the light and gravity factors according to the change in latitude on the Earth's surface. During these changes, the harmonic relationships remain constant. The basic unit for harmonic calculation is the geodetic inch, or one seventy-two thousandth of a minute of arc--one minute of arc being 6,000 geodetic feet (6,076 British feet). If we take the values 1257 and 1850 lines of magnetic force per square centimetre and make a fractional correction to allow for the curvature of the Earth's surface (the given square centimetre area would have fractionally curved sides), we can then establish a theoretical field density of 1257.139035 lines of force in one direction, and 1850.900532 lines of force in the other. This will allow the calculation of the field densities for one square geodetic inch in the north and south pole areas, which can be mathematically related to light and gravity factors. . . .

I have discovered a book entitled The Harmonic Conquest of Space by Bruce Cathie, published August 1, 1998 by Adventures Unlimited Press.

The image on Amazon:

Bruce Cathie's first book, Harmonic 33, was first published in 1968 when he was a commercial pilot in New Zealand. Since then Captain Bruce Cathie has been the premier investigator into the amazing potential of the infinite energy that surrounds our planet every microsecond. The Harmonic Conquest of Space contains all new material and further explores the concept that the earth is criss-crossed by an electromagnetic grid system that can be used for anti-gravity, free energy, levitation and more. Chapters include: Mathematics of the World Grid; the Harmonics of Hiroshima and Nagasaki; Harmonic Transmission and Receiving; the Link Between Human Brain Waves; the Cavity Resonance between the Earth; the Ionosphere and Gravity; Edgar Cayce - the Harmonics of the Subconscious; Stonehenge; the Harmonics of the Moon; the Pyramids of Mars; Nikola Tesla's Electric Car; the Robert Adams Pulsed Electric Motor Generator; Harmonic Clues to the Unified Field; and more. Also included in the book are tables showing the harmonic relations between the Earth's magnetic field, the speed of light, and anti-gravity/gravity acceleration at different points on the Earth's surface.

. . . Construction of the Great Pyramid was done in three stages, he theorized, with the first starting as far back as 20,000 years ago. At the time, the climate was temperate and the land was known as Khemit, he said. . . .

Mehler talked about his work with the "indigenous wisdom keeper" Abdd'el El Hakim Awyam, who he said shared the oral history of Khemit's ancient past with him.The Great Pyramid served as a type of energy device, Hakim told him. In addition he said that water was used as its source of energy and that sound was manipulated to lift and also cut the stones used in the pyramid's construction. . . .

Originally posted by Mary Rose
The Khemit School of Ancient Mysticism looks to be a very good website to explore: Link.

We surmise that their technologies must have often utilized frequency, rather than machining or tools, which is also indicative of a supeior [sic] intelligence. Our research shows that the ancients had the knowledge and ability to change the consistency or molecular structure of matter itself—and therefore, many of our questions and arguments about construction methods and gravity become mute?