Subcategories outreach.wikimedia.org Bookshelf_Project
Fetch pages from outreach.wikimedia.org for category Bookshelf_Project, max 9 levels deep:

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1 Bookshelf_Project -> 3 subcats, 85 articles
    2 Companies -> 3 articles
    2 Finalized Bookshelf Materials -> 2 articles
    2 Using Wikipedia as a teaching tool in higher education (Bookshelf) -> 12 articles

4 unique categories scanned, with in total 101 unique articles (namespace 0), in 1 seconds.