"Screw" on Wikipedia:
https://en.wikipedia.org/wiki/Screw
"Screw Thread" on Wikipedia:
https://en.wikipedia.org/wiki/Screw_thread
Wood Screw Chart:
http://www.wlfuller.com/html/wood_screw_chart.html
Understanding Screw Sizes:
http://diy.stackexchange.com/questions/13824/understanding-screw-sizes
Screws Explained:
http://handycrowd.com/screws-explained-gauge-size-pilot-holes-and-wall-plugs/
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