The choice of the preposition 'on' seems weird in this: "Each topic page collects all the news, reference and archival information, photos, graphics, audio and video files published on topics ranging from A M Castle & Company to Zyuganov, Gennadi A. This treasure trove is available without charge on articles going back to 1981." Could the " on " in "this treasure trove is available without charge on articles" be wrong?
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