Amazon.com: Kalymi Music 4-String Cigar Box Guitar Chord and Fretboard Poster Set : Musical Instruments
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Book One - 4 String: Cigar Box Guitar Jazz & Blues Unlimited - Book One 4 String : Book One: Riffs, Scales and Improvisation - 4 String Tuning GDGB (Series #ONE) (Paperback) - Walmart.com