Holdings
1956,234-310; 1957,1u.3-10u.17u.20-33u.35-37u.39-40u.47-52u.54-81u.83-90u.92-112u.129u.131-149u.151-189u.191-202u.204-240u.243-266u.268-309; 1958,1-250u.252-307; 1959,1-33u.35-311; 1960,1-142u.144-310; 1961,1-191u.193-308; 1962,1-160u.163-309; 1963,1-7u.9-135u.137-154u.156-307; 1964,1-309; 1965,1-310; 1966,1-310; 1967,1-204u.206-309; 1968,1-193u.195-212u.214-309; 1969,1-309; 1970,1-12u.14-279; 1971,1-68u.70-216u.218-269u.271-311; 1972,1-309; 1973,1-308; 1974,1-304; 1975,1-290; 1976,1-300; 1977,1-69u.71u.74-91u.93-217u.219-297; 1978,1-77u.79-296; 1979,1-200u.202-246u.248-270u.272-293; 1980,1-197u.199-282; 1981,1-62u.64-253u.255-262; 1982,1-87u.89-135u.137-191u.193-238u.240-259; 1983,1-130u.132-308; 1984,1-162u.164-309; 1985,1-303; 1986,1-303; 1987,1-124u.126-305; 1988,1-292u.294-303; 1989,1-298; 1990,1-77u.79-150