Problèmes économiques.

1654-1679 INC; 1705-1729; 1730-1754; 1756-1780; 1781-1804; 1805-1830; v.1881-1891; no.140-156 (1950:Sept.-Dec.); no.157-173 (1951:Jan.-Apr.); no.174-191 (1951:May-Aug.); no.192-208 (1951:Sept.-Dec.); no.209-226 (1952:Jan.-Apr.); no.227-243 (1952:May-Aug.); no.244-261 (1952:Sep.-Dec.); no.279-295 (1953:May-Aug.); no.296-313 (1953:Sept.-Dec.); no.314-330 (1954:Jan.-Apr.); no.418-443 1956 Jan-Jun; no.444-469 1956 Jul-Dec; no.470-495 1957 Jan-Jun; no.496-522 1957 Jul-Dec; no.523-547 1958 Jan-Jun; no.548-574 1958 Jul-Dec; no.575-600 1959 Jan-Jun; no.601-625 1959 Jul-Dec; no.627-652 1960 Jan-Jun; no.653-678 1960 Jul-Dec; no.679-704 1961 Jan-Jun; no.731-756 1962 Jan-Jun; no.757-782 1962; no.766-782 (1962:Sept.-Dec.); no.783-808 1963; no.809-835 1963; no.836-861 1964; no.862-887 1964; no.870-887 (1964:Sept.-Dec.); no.888-913 1965; no.914-939 1965; no.940-965 1966; no.966-991 1966; no.992-1008 (1967:Jan.-Apr.); no.992-1017 1967 Jan-Jun; no.1009-1026 (1967:May-Aug.); no.1018-1043 1967 Jul-Dec; no.1027-1043 (1967:Sept.-Dec.); no.1044-1069 1968 Jan-Jun; no.1070-1078 (1968:July - Aug.); no.1070-1095 1968 Jul-Dec; no.1079-1095 (1968:Sept.-Dec.); no.1096-1112 (1969:Jan.-Apr.); no.1096-1121 1969 Jan-Jun; no.1113-1130 (1969:May-Aug.); no.1122-1147 1969 Jul-Dec; no.1131-1147 (1969:Sept.-Dec.); no.1148-1165(1970:Jan.-Apr.); no.1148-1173 1970 Jan-Jun; no.1166-1182(1970:May-Aug.); no.1174-1200 1970 Jul-Dec; no.1183-1200(1970:Sept.-Dec.); no.1201-1217(1971:Jan.-Apr.); no.1201-1225 1971 Jan-Jun; no.1218-1234(1971:May- Aug.); no.1226-1252 1971 Jul-Dec; no.1235-1252(1971:Sept.-Dec.); no.1253-1269(1972:Jan.-Apr.); no.1253-1278 1972 Jan-Jun; no.1270-1285(1972:May-Aug.); no.1279-1302 1972 Jul-Dec; no.1286-1302; no.1303-1319; no.1303-1328 1973 Jan-Jun; no.1329-1352 1973 Jul-Dec; no.1353-1378 1974 Jan-Jun; no.1379-1402 1974 Jul-Dec; no.1403-1428 1975 Jan-Jun; no.1429-1453 1975 Jul-Dec; no.1454-1470 (1976:Jan.-Apr.); no.1454-1479 1976 Jan-Jun; no.1471-1485 (1976:May-Aug.); no.1480-1503 1976 Jul-Dec; no.1486-1503 (1976:Sept.-Dec.); no.1504-1520