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hello, i happen to own one of these, so i collected a few imho. useful links: * https://curta.li/00_main/index.html https://curta.li/00_main/index.html german manual * https://curta.li/05_anleitungen/index.php https://curta.li/05_anleitungen/index.php series # https://curta.li/pict/pdf/Curta_Calculating_Techniques.pdf https://curta.li/pict/pdf/Curta_Calculating_Techniques.pdf # https://curta.li/pict/pdf/cct_curta_calculating_techniques.pdf https://curta.li/pict/pdf/cct_curta_calculating_techniques.p... articles * https://arstechnica.com/science/2021/12/the-remarkable-history-of-the-hand-cranked-curta-mechanical-calculator/ https://arstechnica.com/science/2021/12/the-remarkable-histo... cheers