Problèmes économiques.

1654-1679 INC; 1705-1729; 1730-1754; 1756-1780; 1781-1804; 1805-1830; v.1881-1891; 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.783-808 1963; no.809-835 1963; no.836-861 1964; no.862-887 1964; no.888-913 1965; no.914-939 1965; no.940-965 1966; no.966-991 1966; no.992-1017 1967 Jan-Jun; no.1018-1043 1967 Jul-Dec; no.1044-1069 1968 Jan-Jun; no.1070-1095 1968 Jul-Dec; no.1096-1121 1969 Jan-Jun; no.1122-1147 1969 Jul-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.1454-1479 1976 Jan-Jun; no.1480-1503 1976 Jul-Dec; no.1504-1520(1977:Jan.-Apr.); no.1504-1529 1977 Jan-Jun; no.1521-1536(1977:May-Aug.); no.1530-1553 1977 Jul-Dec; no.1537-1553(1977:Sept.-Dec.); no.1554-1570(1978:Jan.-Apr.); no.1554-1579 1978 Jan-Jun; no.1571-1586(1978:May-Aug.); no.1580-1603 1978 Jul-Dec; no.1587-1603(1978:Sept.-Dec.); no.1604-1620(1979:Jan.-Apr.); no.1604-1629 1979 Jan-Jun; no.1630-1653 1979 Jul-Dec; no.1654-1679 Jan.-Juin 1980; no.1654-1679 1980 Jan-Jun; no.1680-1704; no.1680-1704 Juil.-Dec.1980; no.1680-1704 1980 Jul-Dec; no.1705-1729 Jan.-Juin 1981; no.1705-1721 1981; no.1722-1736 1981 May-Aug; no.1737-1757 1981 Sep-Dec; no.1755-1771 1982 Jan-Apr; no.1772-1786 1982; no.1787-1804 1982 Sep-Dec; no.1805-1821 1983 Jan-Apr; no.18