The Boletim was initially published in Coimbra by the Imprensa da Universidade [University Press] (1929–1932) before its publication moved to Lisbon in 1933, where the ACL itself took over editorial responsibility. However, until 1934, the places of publication and printing remained separate, with printing continuing in Coimbra. The issues were typically published in the year to which they referred, except for the final instalments: volumes 47 to 49 (1975–1977) were printed in 1977, 1980, and 1982, respectively.

For this study, the volumes consulted, sequentially and without interruption, were those from 1929 to 1939 (11 volumes), 1947 to 1951 (5 volumes), 1958 to 1962 (5 volumes), and 1970 to 1975 (6 volumes), in a sample of 27 complete volumes over 49 years of publication. Volumes, whether individual or complete, referring to other years have also been reviewed and will be considered here whenever they provide relevant information.

The Boletim produced 49 volumes annually. The distribution of issues during the calendar year was irregular, varying greatly, but there was always a break during the holiday months of August and September. The following table presents information on ten randomly selected years of publication, arranged in descending order of page count:

(1) With a single four-monthly issue for July-October. (2) Quarterly figures for May-July and October-December. (3) October-November bimonthly issue. (4) Monthly in October, November and December; bi-monthly in January-February and June-July; quarterly in March-May. (5) Issues dedicated to January-March (quarterly), April-July (four-monthly) and August-December, in this case 5 months. (6) Monthly figures for March and December, the rest bi-monthly. (7) Only the figures for October/December have been published.

The publication frequency ranged from monthly to quarterly, and at times, it even extended to five months, as was the case between 1968 and 1973. After the 25th April Revolution, the issues became annual, starting in 1975 with Volume 47. The volumes from 1975 and 1976 were comparatively small, with editions of 260 and 238 pages, a trend that had already been observed in 1970 and 1973, where the average page count was less than three hundred per year.

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