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Where does the balloon come from?
mp3 file of the author reading part of the introduction to the book

Where to get lightweight trash bags
Information about which supermarket trash bags can be used to make balloons.

Solar Tetroon Lift Calculator Spreadsheet
A spreadsheet to calculate the amount of lift generated by the four-sheet solar tetroon from the book.

wire free ufo
How to make a wire-free version of the long duration UFO balloon from The Hot Air Balloon Book
Solar Power data
Website links to information about solar radiation around the world