Each vol., 1907-27, issued in 2 separately paged parts: Artículos científicos i literarios (called 1901-21 Memorias científicas i literarias) and Boletín. Beginning in 1928, the Artículos and Boletín are again issued in separate volumes (1928-32 have identical vol. numbering) Beginning in 1931 the designation "Artículos científicos i literarios" is omitted.
Two vols. (varies slightly) issued each year, 1870-1900: Memorias científicas i literarias and Boletín de instrucción pública.
Vols.for 1859-1920 called t.15-147; 1921-22 called t.168-170; 1923-30 called 2.ser,año 1-8; 1931-32 called 3.ser,año 1-2; 1933- called 3.- ser.,año 91- (no.9- )
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