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Ancient cities that survived the collapse of their parent civilizations.

Constantinople, Roman metropolis that became the center of Byzantine power.
Guzana, which survived the collapse of the Assyrian Empire.
Heracleopolis, which recovered soon after disintegration of the Old Kingdom.
Lamanai, where Mayans maintained an urban center well into the Spanish period.
Naachtun, whose residents maintained urban life beyond the collapse of Mirador.
Pinnacle Ruin, where Anasazi survivors rebuilt.
Tayinat, capital of the Land of Palastin during the dark part of the Iron Age.

Comparative analysis of collapse.

Collapse, How Societies Choose to Fail or Succeed, by Jared Diamond.
The Collapse of Complex Societies, by Joseph A. Tainter.

Dark age events.

Fall of Mycenaean Civilization, nasty, brutish and prolonged.
Final Destruction of the Library at Alexandria, a typical dark age stunt.
Late Bronze Age Climate Change, likely contributor to regional crop failure.
Viking Raids, the sort of behavior you can expect during a dark age.

Data rot, the insidious decay of information.

Antikythera Computer, example of an ancient technology lost for centuries.
Definition and Overview of the Problem, from the Foundation for Data Permanence.
Digital Dark Age, an IBM take on the challenge of digital preservation.
Digital Doomsday, from New Scientist in February 2010.
Fragility of Microprocessors, a challenge to preservation of knowledge.

Measures taken to preserve current knowledge or technology beyond a collapse.

Georgia Guidestones, with a few lines of controversial advice for our descendants.
Rosetta Disk, first installment of the Long Now Foundation’s 10,000 Year Library.
Svalbard Seed Vault, a project of the Global Crop Diversity Trust.

Measures taken to preserve past knowledge or technology beyond a collapse.

How the Irish Saved Civilization, by Thomas Cahill.

Miscellaneous other hyperlinks relevant to the Perenno mission.

Copyright Laws, as they apply to libraries and archives.
Drake Equation, in which Perenno strategies could influence Variable “L.”
Foundation Series, novels by Isaac Asimov that inspired the Perenno idea.
Pantelegraph, example of an old technology that could help us recover from collapse.
1896 Hay Loader, example of an old patent that could be useful again after collapse.
The Story of the Submarine from the Earliest Ages to the Present Day, by Cyril Field
Top Three Books to Rebuild Civilization, opinions beyond the ivory tower.
World Gross Domestic Product, estimated from one million BC to present.

Organizations devoted to non-apocalyptic preservation of knowledge or technology.

Corbis Corporation, which stores the Corbis Collection of irreplaceable film in a cave.
Foundation for Data Permanence, in Thun, Switzerland.
Internet Archive, featuring the WayBack Machine.
Library of Congress, National Digital Information Infrastructure and Preservation.
Museum of Computing, in Swindon, England.
National Archives, document and special media preservation.
Open Planets Foundation, promoting the Planets Project from London, England.
Society of American Archivists, in Chicago, Illinois.

Storage media with very good to excellent long-term potential.

Cranberry DiamonDisc, an optical solution requiring electricity and spare parts.
Digital Microfilm, an old possibility with a surprising new twist.
Etched Metal, an excellent microscopic backup for the most essential documents.
LTO Magnetic Tape, an old possibility that we should not dismiss out of hand.
Millenniata M-Disc, another optical solution requiring electricity and spare parts.
Paper, a solution limited by storage space but accessible to the naked eye.
Sun Fire x4500 Servers, hardware for Internet modular data centers.

Techniques, tools and methods for managing archives.

Approaches to Digital Preservation, including encapsulation, emulation and migration.
Digital Asset Preservation Tool, a universal virtual computer solution by IBM.
Digital Preservation Management, a tutorial for implementing short-term solutions.
Planets Suite, software for planning and implementing digital preservation initiatives.

Threats and threat management.

101955 1999 RQ36, more likely than fire to wipe out your house.
A List of Insurance Probabilities, including the odds of a typical house burning down.
Hazard Maps, a resource to avoid building a Perenno facility in a danger zone.
Nuclear Policy, a collection of historical documents.
Risk Assessment, including statistical tools to calculate insurance premiums.
Yellowstone Supervolcano, a potential civilization killer.

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