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Holdings:
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no.23 (1968); no.31 (1968); no.37 (1969); no.42 (1969); no.53 (1969) - no.64 (1970); no.67 (1970); no.70 (1970); no.91 (1970); no.93 (1970); no.95 (1971); no.100 (1971); no.103 (1971); no.109 (1971); no.116 (1972); no.120 (1972); no.127 (1972); no.131 (1972); no.138 (1972); no.149 (1973); no.161 (1973); no.163 (1973); no.165 (1973); no.177 (1973); no.180 (1974); no.184 (1974); no.191 (1974); no.196 (1974); no.198 (1975); no.201 (1975); no.207 (1975); no.211 (1975) - no.220 (1976); no.222 (2976); no.228 (1976); no.230 (1976); no.234 (1976); no.237 (1977); no.241 (1977); no.245 (1977); no.252 (1977); no.255 (1977); no.259 (1977); no.263 (1977) - no.269 (1978); no.271 (1978); no.273 (1978); no.276 (1978); no.282 (1978); no.284 (1978); no.287 (1978); no.289 (1978); no.291 (1978); no.294 (1978); no.302 (1978); no.304 (1979) - no.342 (1980); no.400 (1982); no.413 (1982); no.417 (1982);
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