20th Century Media Information Database
Index to the magazines and newspapers held at the Gordon Prange Collection, University of Maryland
Individual subscription services are available through NPO Institute of Intelligence Studies
Magazin Plus, Book Plus. Access to indexed journal articles and books
A link to the registration form for individual subscription can be found here
Index from Ōya Sōichi Bunko, a collection of popular journals
Details of individual subscription can be found here
Access to Yomiuri Newspaper's articles dating back from 1874 to the present.