Contribution.

no.1-25 1959-1963; no.26-50 1959-1964; no.51-75 1964-1965; no.51-75 1964-65; no.76-100 1964-1966; no.76-100 1964-66; no.101-125 1965-1966; no.101-125 1965-66; no.126-150 1965-1967; no.126-150 1965-67; no.151-175 1966-1967; no.151-175 1966-67; no.176-200 1966-1967; no.201-225 1966-1967; no.226-250 1967-1968; no.226-250 1967-68; no.251-275 1967-1968; no.276-300 1967-1968; no.276-300 1967-68; no.301-325 1967-1968; no.326-350 1968; no.401-425 1969; no.426-450 1969; no.476-500 1969; no.351-375 1965-1970; no.351-375 1968-1970; no.376-400 1968-1970; no.451-475 1969-1970; no.476-500 1969-1970; no.501-525 1969-70; no.501-525 1969-1971; no.526-550 1970-1971; no.526-550 1970-71; no.551-559 1970-73; no.551-559 1970-1975