Original: This includes 73,645 regular Britannica articles, with the remainder drawn from the Britannica Student Encyclopædia, the Britannica Elementary Encyclopædia and the Britannica Book of the Year (1993–2004), plus a few "classic" articles from early editions of the encyclopaedia.
Simplified: It includes 73,645 Britannica articles, with the other articles from the Britannica Student Encyclopædia, the Britannica Elementary Encyclopædia and the Britannica Book of the Years (1993–2004), plus a few old articles from old editions of the encyclopaedia.