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16. Udo Oberem letter to Erwin Barth von Wehrenalp, October 12, 1972. From the author's archive (Archive
No. 0238/ECON documentation).

17. Erwin Barth von Wehrenalp letter to Ramon Burneo, October 6, 1972. From the author's archive (Archive
No. 0238/ECON documentation).

18. Ramon Burneo letter to Erwin Barth von Wehrenalp, October 18, 1972. From the author's archive (Archive
No. 0238/ECON documentation).

19. Erich von Däniken letter to Dr. Pena, November 11, 1972. From the author's archive (Archive No.
0238/ECON documentation).

20. Erich von Däniken letter to Dr. Pena, December 29, 1972. From the author's archive (Archive No.
0238/ECON documentation).

21. Erich von Däniken letter to Erwin Barth von Wehrenalp, January 7, 1973. From the author's archive
(Archive No. 0238/ECON documentation).

22. Dr. Gerardo Pena Matheus letter to Erich von Däniken, January 26, 1973. From the author's archive
(Archive No. 0238/ECON documentation).

23. Document of the members of the «Expediciôn 1969». Signed by all participants. From the author's archive
(Archive No. 0232).

24. Erich von Daniken letter to Dr. Pena, February 1, 1973. From the author's archive (Archive No.
0238/ECON documentation).

25. James B. Mobley (Media Associates Company, Los Angeles, California) letter to Erich von Däniken,
March 5, 1973. From the author's archive (Archive No. 0238/ECON documentation).

26. Erich von Däniken letter to Dr. Pena, March 16, 1973. From the author's archive (Archive No. 0238/ECON
documentation).

27. Thompson, Ron. «The Mystery of Ecuador's Secret Treasure». Newspaper article from June 17, 1973.
From the author's archive (Archive No. 0095).

28. «Juan Moricz realizaria una nueva expediciôn».

29. «Pueden tildarme de loco» (and various other articles from the author's archive; Archive No. 02699).

30. Erich von Däniken letter to Neil Armstrong (Cincinnati), February 18, 1977. From the author's archive
(Archive No. 01752).

31. Neil Armstrong letter to Erich von Däniken, February 24, 1977. From the author's archive (Archive No.
01752).

32. «Auf den Spuren».

33. Däniken, In Search of Ancient Gods.

35. Kauf hold. Von den Göttern.

36. Professor Gebhardt letter to Erich von Däniken, November 29, 1972. From the author's archive.

37. Lechtmann, «Vorkolumbianische Oberflächenveredelung».

38. Berlitz, Geheimnisse.

39. Borges, «La Cueva de los Tayos».
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