The original HPG files are also available. I also suggest that you print out the technical article for reference during assembly, unless you happen to have your soldering iron next to your computer. Additional sources are listed at the Poptronics site. The component side is silk-screened with the component layout for ease of assembly. The few components that mount onto pads on the wiring side are indicated also.
Circuit traces are tin-plated for protection and ease of soldering.
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