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Introduction to programming, TI Programmable 57 by Texas Instruments [1977] {510.28542--oclc} : Texas Instruments : Free Download, Borrow, and Streaming : Internet Archive
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TI-57 – Wikipedia
Dr. Monk's DIY Electronics Blog: TI Programmable 57 Calculator Battery Conversion
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TEXAS-INSTRUMENTS TI-57 – Le Rayon des Calculatrices
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Virtual Museum of Calculators
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