Where can I find a book on the methodology of learning foreign languages ​​by Yakov Trakhtenberg?

Question

IT education

The system of the Zurich professor, a native of Odessa Yakov Trachtenberg (1888-1953), is aimed at training the speed of calculations. If you can give the system a significant amount of time to complete the exercises, then the counting speed will increase many times over! This is an amazing method that is fundamentally different from the standard study of mental counting in school.
Yakov Trakhtenberg graduated from the St. Petersburg Mining Institute. Since 1919, Yakov lived in Germany, later moved to Austria. In the postwar years, Trachtenberg created a mathematical institute in Zurich and headed it.
In addition to mathematical activity, Yakov Trakhtenberg is known as the author of a unique author's method for studying foreign languages.
I did not find this unique method of learning foreign languages ​​anywhere. Can anyone help??? Who heard about her? Was reading? Know the method? How to find?

Answer 1

I understand that this book was published only in the USA and exists only in the original language (English). You can find it in electronic form at gen.lib.rus.ec on request "Trachtenberg System"