Book Reviews : Bolivia: A Land Divided. By HAROLD OSBORNE. (London and New York: Royal Institute of International Affairs. 1954. Pp. x, 144. $2.50.) Ecuador: Country of Contrasts. By LILO LINKE. (London and New York: Royal Institute of International Affairs. 1954. Pp. x, 173. $2.50.) Paraguay: A Riverside Nation. By GEORGE PENDLE. (London and New York: Royal Institute of International Affairs. 1954. Pp. vi, 115. $2.50.)