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I don't know if this has been posted before, but I found this book and thought some of you might find it interesting. https://s3-eu-west-1.amazonaws.com/b...SAILPLANES.pdf
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Another good one, A Quick Reference Guide to Wooden Sailplanes Built by Slingsbys. http://www.glidingheritage.org.uk/do...y_guide_v3.pdf
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