Recovered from Shipwreck
The Permanence Institute
4.65 mb

Predicting Eclipses
The Permanence Institute
4.65 mb

Tracking Planets
The Permanence Institute
3.87 mb

Analog Computer
The Permanence Institute
4.84 mb

Technology Not Seen Again
The Permanence Institute
4.45 mb

Gears Meshing
The Permanence Institute
8.44 mb

In a Single Sinking
The Permanence Institute
9.8 mb

Bronze Corroded Green
The Permanence Institute
7.3 mb

87 BC Maybe
The Permanence Institute
7.89 mb

Knowledge Lost
The Permanence Institute
12.19 mb

For Fourteen Hundred Years
The Permanence Institute
8.71 mb