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Amazon.com: Sliding Ruler - Magic tool for the practice of PENTATONIC, DIATONIC and MODE scales/Pentatonic Sliding Ruler for Guitar: The essential tool for ALL Guitarists: Musical Instruments
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Diatonic Major and Minor Scales in Standard Notation and Tablature by Andrés Segovia, Paperback | Barnes & Noble®
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Complete Diatonic Scales for Guitar: by Patrick Picarsic - Kindle edition by Picarsic, Patrick, Hubbard, Christina. Arts & Photography Kindle eBooks @ Amazon.com.
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This is the first guitar scale you should learn because it's really easy for beginners - Songwriter Nation
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