Got ahold of a Casio fx-991ex and CG-50 to match my Classpad II. I'm really impressed with them but there is something about the fx-991ex... (see comments) : r/calculators
fx-991EX: Solving for y or f(x) for Specific Values of x - YouTube
Casio fx-991EX Classwiz for High School Students: Getling, David: 9781548247102: Amazon.com: Books
Casio fx-991EX and fx-991CW : r/calculators
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FX991 EX Original Calculator - Apps on Google Play
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