While official Theosophy kept Dzyan on the Earth, unofficially, it was travelling to the stars. Franklin Ellsworth Parker wrote a book in 1916 called Christian Wisdom that tried to marry Christianity and Theosophy, and he assumed (wrongly) that the ascended masters who wrote the Dzyan were the same as the ones who lived on the Moon, which has Sanskrit as its lingua franca. He also threw in some Aryan supremacy just for kicks:
The Aryan civilization is one of the oldest civilized nations of earth and the book of Vedas next to the Dzyan the oldest work. The book of Dzyan was written by moon souls 24,000 years ago and 2000 years later Brahmin, a Jupiter spirit father, wrote the book of Vedas from the book of Dzyan, but mutilated on questionable lines to suit the convenience of his own selfish personality and obscure the universal soul principle of Divinity. […] Ancient philosophy was the religion of eternal truth and the greatest teachers lived in the Himalayas. (pp. 174-175)
Nevertheless, Blavatsky’s Dzyan was wildly popular not just with Theosophists but with writers and artists who made reference to it as well. In 1935, H. P. Lovecraft included the book in his revision of “The Diary of Alonzo Typer,” having borrowed the information about Theosophy secondhand. He wrote in “Alonzo Typer” that “I learned of the Book of Dzyan, whose first six chapters antedate the earth, and which was old when the lords of Venus came through space in their ships to civilise our planet.”
As it happens, we know exactly where Lovecraft got the idea from. He learned of it directly from E. Hoffman Price in the winter of 1933, as he confesses in a letter if February 18, 1933:
[E. Hoffmann] Price has dug up another cycle of actual folklore involving an allegedly primordial thing called The Book of Dzyan, which is supposed to contain all sorts of secrets of the Elder World before the sinking of Kusha (Atlantis) and Shalmali (Lemuria). It is kept at the Holy City of Shamballah, and is regarded as the oldest book in the world --- its language being Senzar (ancestor of Sanscrit), which was brought to earth 18,000,000 years ago by the Lords of Venus. I don't know where E. Hoffmann got hold of this stuff, but it sounds damn good. (Selected Letters, vol. IV, p. 155)
Man’s organism was adapted in every race to its surroundings. The first Root-Race was as ethereal as ours is material. The progeny of the seven Creators, who evolved the seven primordial Adams, surely required no purified gases to breathe and live upon […] Therefore, however strongly the impossibility of this teaching may be urged by the devotees of modern science, the Occultist maintains that the case was as stated aeons of years before even the evolution of the Lemurian, the first physical man, which itself took place 18,000,000 years ago. Preliminary evolution is described in one of the Books of Dzyan and the Commentaries thereon in this wise…
But what I wasn’t able figure out in 2012 is how Lovecraft’s and Price’s notion that the book is older than the Earth ended up in Erich von Däniken’s Gods from Outer Space (1970). In that book, Däniken summarizes Blavatsky Secret Doctrine more or less correctly, from the German edition, but offers these lines that have no acknowledged source in the text:
Then we have the Book of Dzyan with its sacred symbolic signs. No one in the world knows its real age. It is said that the original is older than the earth. It is also said that it was so strongly magnetised that the ‘elect’ who took it in their hands saw the events described pass before their eyes and at the same moment they could understand the mysterious texts through rhythmically transmitted impulses, provided their language had an adequate vocabulary.
But now I know.
It turns out that our friends have all been working on parallel tracks because they were all copying from the same source. All of these different versions come, directly or indirectly, from material probably best known from the 1911 book The Inner Life by Theosophist Charles Webster Leadbeater:
In the case of The Book of Dzyan the comprehension of the symbol is enormously assisted by the fact that the book itself is highly magnetized in a peculiar way, so that when the student who is privileged to see it takes one of the pages in his hand a remarkable effect is produced upon him. Before his mind’s eye arises the picture of that which the page is intended to symbolize, and simultaneously he hears a sort of recitation of the stanza which describes it. It is very difficult to put this clearly into words, but the experience is a wonderful one.
I have myself seen and handled the copy which Madame Blavatsky describes—from the study of which she wrote The Secret Doctrine. That is of course not the original book, but the copy of it which is kept in the occult museum which is under the care of the Master K. H. The original document is at Shamballa, in the care of the Head of the Hierarchy, and is certainly the oldest book in the world. Indeed it has been said that part of it (the first six stanzas, I think) is even older than the world, for it is said to have been brought over from some previous chain. That most ancient part is regarded by some as not merely an account of the processes of the coming into existence of a system, but rather a kind of manual of directions for such an act of creation. Even the copy must be millions of years old.
And there you have it. Price, Lovecraft, Bergier, Däniken, and a host of others all copied directly or indirectly from these claims. However, I am not sure exactly which version each of these authors got it from. Leadbeater suggests that the information came from an older source, and indeed it did. Leadbeater borrowed the facts from his own article in vol. 30 of The Theosophist from 1909 in a commentary on The Voice of Silence, one of the books of Helena Blavatsky:
The original of the Book of Dzyan is in the hands of the august Head of the Occult Hierarchy, and has been seen by none. None knows how old it is, but it is rumoured that the earlier part of it (consisting of the first six stanzas), has an origin altogether anterior to this world, and even that it is not a history, but a series of directions – rather a formula for creation than an account of it. A copy of it is kept in the museum of the Brotherhood, and it is that copy (itself probably the oldest book produced on this planet) which Madame Blavatsky and several of her pupils have seen – which she describes so graphically in The Secret Doctrine. The book has, however, several peculiarities which she does not there mention. It appears to be very highly magnetized, for as soon as a man takes a page into his hand he sees passing before his eyes a vision of the events which it is intended to portray, while at the same time he seems to hear a sort of rhythmic description of them in his own language, so far as that language will convey the ideas involved. Its pages contain no words whatever – nothing but symbols. (p. 591)