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@@ -2489,7 +2489,7 @@ Kerridge (PDF) (email address *requested*, not required)
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* [The Definitive Ruby Tutorial For Complete Beginners](https://www.rubyguides.com/ruby-tutorial/) - Jesus Castello
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* [The Ruby Reference](https://rubyreferences.github.io/rubyref/) - Victor Shepelev
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* [The Unofficial Ruby Usage Guide (at Google)](http://www.caliban.org/ruby/rubyguide.shtml) - Ian Macdonald
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-* [Using Blocks in Ruby](https://www.oreilly.com/programming/free/using-blocks-in-ruby.csp) - Jay McGavren (email address *requested*)
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+* [Using Blocks in Ruby](https://www.oreilly.com/programming/free/files/using-blocks-in-ruby.pdf) - Jay McGavren (PDF)
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* [Why's (Poignant) Guide to Ruby](http://poignant.guide)
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