There are many good sources of information for Metapedia articles available. In this page we try to compile a list of the most important ones.
Project Gutenberg (PG) is a project to digitize, archive, and distribute books and other public domain works. It was founded in 1971 by Michael Hart and is the oldest digital library. Project Gutenberg has over 21,000 works in its collection.
Encyclopædia Britannica Eleventh Edition (1911) is the most famous edition of the Encyclopædia Britannica. Many of its articles were written by well known scholars. Project Gutenberg is making an electronic version which be freely available from Project Gutenberg when finished. Two websites have it available unproofread and without the illustrations.
WikiIslam is an alternative wiki encyclopedia with its focus on criticism of Islam. It has many articles about muslim conquering quests against Europe and European resistance. See for example this article about the Reconquista.