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/ ghadeerrrr@gmail.com modernlibrariantools.blogspot.com

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Invisible Web Deep Web, Hidden Web : PDF Databases .

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Visible Web Search Engines: . Spiders Crawlers.

1. Crawlers: . :Google Bing.

2. Meta search engines: : Mamma Dogpile.

3. :Vertical Search Engines (Specialized) .. . : LISZEN Microsoft Academic Search.

Visible Web Directories: . : Libdex DFAJ.

/ Hybirds: . . : MSN.

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3. . digital literacy, computer literacy, media literacyolder adults, older people, elderly

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5. " " : " " "digital literacy of older adults".

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URLhttp://www.ilovelibraries.org/

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Top-level domain :

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1. . http://archive.kaust.edu.sa/kaust/2. An-Najah Scholars. http://scholar.najah.edu/

1. ARAN: Access to research at NUI Galway. http://aran.library.nuigalway.ie/xmlui 2. Cadair: Aberystwyth University Open Access Repository. http://cadair.aber.ac.uk/dspace/

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1. . http://libraries.kau.edu.sa/Pages-%D8%A7%D9%84%D9%85%D8%B3%D8%AA%D9%88%D8%AF%D8%B9-%D8%A7%D9%84%D8%B1%D9%82%D9%85%D9%8A.aspx2. . https://www.taibahu.edu.sa/Pages/AR/Sector/SectorPage.aspx?ID=13&PageId=50

1. E-prints in Library and Information Science. http://eprints.rclis.org/2. IFLA Library. http://library.ifla.org/

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1. - . http://library.iugaza.edu.ps/thesis.aspx2. .http://bu.umc.edu.dz/md/index.php?id_thes=6

1. Open Access Theses and Dissertations (OATD). http://oatd.org/

2. PQDT Open. http://pqdtopen.proquest.com/

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