Abstracts are a combination of a summary and a conclusion. They aim to give the reader a brief overview of the text highlighting some key results/discussions/points but without too much detail. They enable the reader to identify whether the text is what they want without them having to read the whole text.
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they are both reference works that reveal detailed information about resources. Indexes usually provide authors, titles or subjects of publications without comment, and abstracts offer a brief summary of content.
The right name is actually 'Entrez' and 'PubMed'. PubMed is a library dedicated to medical researches with millions of citations and databases, including e-journals. Entrez is a search system connected to databases (like databases for MEDLINE and PubMed).
2 500 years ago these ideas were too revolutionary, abstracts and strange.
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The largest library in the America is the Library of Congress. This library is home to over 29,550,914 books and documents.