good vs. bad sources

Bad historical website:

This site is a bad historical source because there is no bibliography, and no reason to be sure that the author did not merely make up the answer.

good historical website:

This site is from a trustworthy organization (Library of Congress).

good primary source:

This source has the bibliographic information for where the poster was published, and is from a credible source (Library of Congress).

Bad primary source:

There is no way to tell which of these posters are genuine, which are airbrushed from genuine, and which are made up.

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