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Depending on what grade you're in, try putting 'microbes that can't be cultured' into a search engine like Google or into Google Scholar (http://www.googlescholar.com), which will give you scientific papers on the topic. I was able to find lots of information in just a few minutes with that search.
Have you tried looking for a microbiology textbook in your library? If those are at all recent they'll have a section (or several sections!) on microbes that can't be cultured.
Have you tried looking for a microbiology textbook in your library? If those are at all recent they'll have a section (or several sections!) on microbes that can't be cultured.