Bloch A.S. The Scientific Foundations of a School Mathematics Course. Natural Numbers. Lectures In Russian/Blokh A.Sh. Nauchnye osnovy shkolnogo kursa matematiki. Naturalnye chisla. Teksty lektsiy Minsk Minsk Gorky Institute of Education, 1976, 36 p. Please contact us for details on condition of available copies of the book. SKUalb6d9caf02eec52187.