Voronov A. Sobranie arifmeticheskikh zadach. Chast II-ya (drobi i troynye pravila). 4-e izdanie/Voronov A. A collection of arithmetic problems. Part II (fractions and triple rules). 4th edition In Russian - landofmagazines.com

TransliterationVoronov A. Sobranie arifmeticheskikh zadach. Chast II-ya (drobi i troynye pravila). 4-e izdanie

In EnglishVoronov A. A collection of arithmetic problems. Part II (fractions and triple rules). 4th edition In Russian

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