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For Wikipedia's policy on the use of tertiary sources, see WP:PSTS.
Encyclopædia Britannica 11th Edition 1911 Volume 27 pages 788-789 "URALSK-URBAN"

A tertiary source (also called thirdhand) is an index or a summary of primary and secondary sources. In research, tertiary sources are used as a guide to help find primary and secondary sources of information. Tertiary sources are very useful to find search terms for online literary searches. While tertiary sources are easy to find they are usually not considered useful for college-level research projects.

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