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Casio fx-991EX YES thread and appreciation station [fanthread] [greatcalc] - The Something Awful Forums
File:Casio fx-991EX.jpg - Wikimedia Commons
Why does the German version of the Casio fx-991EX, the fx-991DE X, have more functions than the US version? : r/calculators
Equation Solve for X – fx-991EX - Casio Calculator Tutorials - George Garside
