Analysis of the scientific content distributed electronically by Emerald, Kluwer, ScienceDirect, SpringerLink, Taylor & Francis and Wiley InterScience. Three indicators were established for the evaluation: horizontal, thematic, and vertical coverage. The study was performed based on the subscriptions held by the University of Leon (Spain), with the exception of Kluwer and Taylor & Francis for which the analysis was done via free web access. These electronic suppliers are multidisciplinary, though the content offered is fundamentally limited to the areas of natural sciences, health sciences, and social sciences. [ABSTRACT FROM AUTHOR]