Vols. 1-<v. 11> were issued in parts each being a subseries with their own numbering. Beginning with volume 15 (1988/1989) each issue includes several of the previous sections continuing their earlier numbering, e.g. Vol. 16 has: Sección Biología animal, 5; Sección Biología vegetal, 5; Sección Biología ambiental, 5; Sección Biología molecular y microbiana, 4 [sic]
Notes
Separately classified in LC prior to volume 15 (1988/1989). DLC