Communications de l'Observatoire royal de Belgique.

no.1 1949-50; v.1 no.1-13,15-25 1948-1951; no.2 1950-51; v.2-3 no.26-75 1951-1954; no.3 1952-54; no.77 1955; no.4 1954-56; v.4 no.76,78-87,89-100 1956; no.101-125; v.5 no.101-125 1954-1957 Incompl.; no.5 1955-57; no.6 1957-59; v.6 no.126-150 1957-1959; no.7 1959-60; v.7 no.151-175 1959-1960; no.176-186; v.8 no.176-188 1960-1961; no.8 1960-62; no.187-190; v.8 no.189-200 1961-1962; no.9 1962-64; no.191-200; v.9 no.201-225 1962-1964; no.10 1964-66; no.226-235; v.10 no.226-250 1964-1966; no.236; no.237-250