I own several blogs, how to import all the blog posts from one to another? And after imported, is the posts still avalible in the first blog site?

I’m doing a survey of people who read and subscribe to science blogs, and part of it entails visiting top-rated science blogs in order to contact these people (with the moderator’s permission, of course).

I Googled it, but I found many different sources that list different blogs. I’m not sure which one is the best source.

My list can also include blogs in other languages, and not just English.

Thanks in advance.

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