Geological Survey circular.

no.2 1933; no.3 1933; no.4 1933; no.5-14 1934-1946; no.16-18 1947; no.36 1948; no.22-24 1948-1949; no.29-32 1948-1949; no.27 1949; no.41-45 1949; no.50 1949; no.52 1949; no.53 1949; no.55 1949; no.56 1949; no.57 1949; no.58 1949; no.59 1949; no.61 1949; no.62 1949; no.63 1949; no.64 1949; no.65 1949; no.167 1947/1950; no.66-69 1949-1950; no.303 pt.2 1949/1950; no.38 1950; no.68-76 1950; no.77-85 1950-1951; no.86-96 1950-1951; no.51 1951; no.100 1951; no.103 1951; no.104 1951; no.105 1951; no.110-114 1951; no.115 1951; no.115-125 1951; no.126 1951; no.128 1951; no.130 1951; no.131-133 1951; no.135-137 1951; no.139 1951; no.140-146 1951; no.148 1951; no.151 1951; no.102-109 1950-1952; no.129 1952; no.149 1952; no.150 1952; no.152-155 1952; no.157-161 1952; no.165 1952; no.167 1952; no.168 1952; no.171-174 1952; no.175-180 1952; no.182 1952; no.183 1952; no.184-187 1952; no.188 1952; no.189 1952; no.190 1952; no.192-196 1952; no.206 1952; no.211 1952; no.212 1952; no.213 1952; no.214 1952; no.221 1952; no.232 1952; no.269 1952; no.198-202 1952-1953; no.207-210 1952-1953; no.217-227 1952-1953; no.163 1953; no.166 1953; no.215 1953; no.223 1953; no.241 1953; no.242 1953; no.243 1953; no.244-252 1953; no.253-255 1953; no.256 1953; no.257 1953; no.258 1953; no.260 1953; no.262 1953; no.263 1953; no.264 1953; no.265 1953; no.266 1953; no.267 1953; no.269-272 1953; no.273-286 1953; no.276 1953; no.280-281,283-284,286-288 1953; no.284 1953; no.288-299 1953; no.289 1953; no.290-291,294-299 1953; no.293 1953; no.228-231 1952-1954; no.234-239 1953-1954; no.309-328 1953-1954; no.259 1954; no.300-307 1954; no.329-336 1954; no.337 1954; no.338 1954; no.339 1954; no.340-350 1954-1955; no.351-359 1954-1955; no.361-367 1955; no.368 1955; no.377 1955; no.379 1955; no.398 1955; no.377 1956; no.379 1956; no.380 1956; no.389 1956; no.391 1956; no.392 1956; no.394 1956; no.401 1956; no.369-376 1955-1957; no.378 1957; no.397 1957; no.398 1957; no.403 1957; no.404 1957; no.412 1958; no.416 1958; no.285 reprint 1959; no.400-419 1957-1960;