Descripción
Publicado:Began with v. 56, no. 2880 (Jan. 31, 1908); ceased with v. 135, no. 5376 (Nov. 1987)
Frecuencia de Publicación:Monthly, Dec. 1957-Nov. 1987
Formato: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.