... Collection of problems in trigonometry, With additional problems in geometry that require the application of trigonometry, For the 8th and 9th classes of secondary schools
английский/... Collection of problems in trigonometry : With additional problems in geometry that require the application of trigonometry : For the 8th and 9th classes of secondary schools / N. Ribkin ; Transl. by J. Schwartz.... Collection of problems in trigonometry : With additional problems in geometry that require the application of trigonometry : For the 8th and 9th classes of secondary schools / N. Ribkin.... Collection of problems in trigonometry : With additional problems in geometry that require the application of trigonometry : For the 8th and 9th classes of secondary schools.Moscow/Leningrad/State text-book publishing house/, 1935 ( ). - State text-book publishing house, 1935. - 106, [2] с. : черт. ; 20 см см.... Collection of problems in trigonometry : With additional problems in geometry that require the application of trigonometry : For the 8th and 9th classes of secondary schools. Moscow, Leningrad, 1935 .
На 4-й с. обл.: Н. Рыбкин. Сборник задач по тригонометрии для средней школы.
На 4-й с. обл.: Н. Рыбкин. Сборник задач по тригонометрии для средней школы.