- Computing Examples for the Curta Calculating Machine
Contina's worked-examples booklet for the Curta: the four basic operations and the short-cut methods built on them, shown step by step with dial settings. Scanned copy; the text layer is OCR and carries errors.
- Curta Calculating Techniques
A loose-leaf set of Curta methods issued free by the British agent, Automatic Business Machines Ltd of London: general techniques, commercial work in sterling, engineering examples, and mathematical procedures such as roots, polynomials and series, with numbered Curta tables. Scanned copy; the text layer is OCR and carries errors.
- Curta Computing Methods — Business and Statistical Examples, with Five-Place Logarithm Tables
A Curta calculating handbook that opens with a product description and goes on to business methods, statistics on grouped data, and five-place logarithm tables. The scan has a blank cover and no title page, so the title given here is descriptive. The text layer is OCR and carries errors.
- The Curta, a Technical Marvel
Herbert Bruderer's 2022 article on Curt Herzstark and the Curta, its manufacture in Liechtenstein, and what newly found patent documents and design drawings show about the Multiple Curta, a parallel calculator.
- Your CURTA Calculator
The Curta operating instructions for Models I and II: handling, the four operations, and care. This is a retyped edition of Contina's printed manual, transcribed by Rick Furr in 1997 and reformatted as a PDF by Daniel Ford in 2005, so its page layout is not the original's.
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