Electronic reproduction. [S.l.] : HathiTrust Digital Library, 2010.
Master and use copy. Digital master created according to Benchmark for Faithful Digital Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002. http://purl.oclc.org/DLF/benchrepro0212
Spanish, with some articles in English and French.
Description based on: Vol. 1, fasc. 1/2 (1980); title from PDF table of contents (PAO, viewed Oct. 3, 2012).