Category:Main topic classifications is a list of Scratchpad’s major topic classifications. They are used throughout Scratchpad to organize the presentation of links to articles in its various reference systems, including Scratchpad’s categories.

An alternative top-level category to begin navigation of articles, based on a smaller number of initial thematic classifications, is Category:Fundamental categories.

The top level of Scratchpad’s overall category system, including both articles and other project pages, is Category:Contents.

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