Arithmetic in grades I and II; a critical summary of new and previously reported research. Supplement - Brownell, William Arthur, 1895- [from old catalog],Doty, Roy Anderson, [from old catalog] joint author,Rein, William C., [from old catalog] joint author

Arithmetic in grades I and II; a critical summary of new and previously reported research. Supplement

Воспроизведено в оригинальной авторской орфографии издания 1941 года (издательство "Durham, N.C., Duke university press").

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