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Programming in Scala, First Edition by Martin Odersky, Lex Spoon, and Bill Venners December 10, 2008 https://www.artima.com/pins1ed/index.html#TOC
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The Neophyte's Guide to Scala https://danielwestheide.com/scala/neophytes.html
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All about scala (tutorials, etc..) http://allaboutscala.com/