Bolshevist Russia. By Anton Karlgren. Translated from the Swedish by Anna Barwell. New York: The Macmillan Co., 1927. pp. 311. $3.50. - Lenin. By Valeriu Marcu. Translated by E. W. Dickes. New York: The Macmillan Co., 1928. pp. 412. Index. $5.00. - Russian Economic Development Since the Revolution. By Maurice Dobb. New York: E. P. Dutton & Co., 1928. pp. xii, 415. $5.00. - The Russian Revolution. By James Mavor. New York: The Macmillan Co., 1928. pp. 470. $7.50.