Exchange bibliography.

no.10 1959; no.36 1967; no.38 1968; no.39 1968; no.42 1968; no.45 1968; no.52 1968; no.53 1968; no.65 1969; no.66 1969; no.67 1969; no.69 1969; no.70 1969; no.80 1969; no.83 1969; no.98-99 1969; no.105 1969; no.115 1970; no.116 1970; no.119 1970; no.126 1970; no.128 1970; no.132 1970; no.136 1970; no.137 1970; no.138 1970; no.144 1970; no.150 1970; no.158 1970; no.160-161 1970; no.166 1970; no.167 1970; no.169 1971; no.170 1971; no.172 1971; no.184 1971; no.194 1971; no.215 1971; no.218 1971; no.221 1971; no.222 1971; no.235 1971; no.251 1972; no.254 1972; no.255 1972; no.256 1972; no.257 1972; no.258 1972; no.259 1972; no.260 1972; no.261 1972; no.262 1972; no.263 1972; no.264 1972; no.265 1972; no.266 1972; no.267 1972; no.268 1972; no.269 1972; no.270 1972; no.271 1972; no.337 1972; no.342 1972; no.344 1972; no.347 1972; no.348 1972; no.352 1972; no.353 1972; no.363-364 1973; no.368 1973; no.373 1973; no.380-381 1973; no.956 1976; no.961 1976; no.971 1976; no.976 1976; no.1058 1976; no.1080 1976; no.1121 1976