[DoctorOhh]

Originally Posted by vipinpa

Yes when I change linear ='yes', then it works in calibre and other epub reader. But when I convert epub file to .mobi file and open in kindle previewer, then cover page showing two times. This is the issue now. I want both work properly.

I don't know what linear ='yes' is.

I just know when I added the symantics cover to your title page via Sigil your title.html became the cover in the ePub. After converting the ePub to mobi (via Calibre) Kindle4PC shows only 1 cover image and all looks good.

Sorry I can't help more.

Update: Some more info for you. After I set the cover via Sigil and saved the ePub file the content.opf file looked like this:

Update 2: Just opening your file in Sigil and saving it without doing anything also created the below result.

<?xml version="1.0" encoding="UTF-8"?>
<package xmlns="http://www.idpf.org/2007/opf" unique-identifier="BookID" version="2.0">
    <metadata xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:opf="http://www.idpf.org/2007/opf">
        <dc:title>American Hemorrhagic Fevers: Global Status - 2010 edition</dc:title>
        <dc:rights>Copyright (C) 2010, Inc</dc:rights>
        <dc:subject>American </dc:subject>
        <dc:creator opf:role="aut">test </dc:creator>
        <dc:publisher>test</dc:publisher>
        <dc:identifier id="BookID" opf:scheme="UUID">2cc5e1dd-84bf-4a3d-ab64-38723e266915</dc:identifier>
        <meta name="cover" content="cover.jpg"/>
        <meta name="Sigil version" content="0.2.0"/>
    </metadata>
    <manifest>
        <item id="ncx" href="toc.ncx" media-type="application/x-dtbncx+xml"/>
        <item id="cover.jpg" href="Images/cover.jpg" media-type="image/jpeg"/>
        <item id="ebook_kindle_disease.css" href="Styles/ebook_kindle_disease.css" media-type="text/css"/>
        <item id="about.html" href="Text/about.html" media-type="application/xhtml+xml"/>
        <item id="chapter1.html" href="Text/chapter1.html" media-type="application/xhtml+xml"/>
        <item id="chapter2.html" href="Text/chapter2.html" media-type="application/xhtml+xml"/>
        <item id="title.html" href="Text/title.html" media-type="application/xhtml+xml"/>
    </manifest>
    <spine toc="ncx">
        <itemref idref="title.html"/>
        <itemref idref="chapter1.html"/>
        <itemref idref="chapter2.html"/>
        <itemref idref="about.html"/>
    </spine>
    <guide>
        <reference type="cover" title="Cover" href="Text/title.html"/>
    </guide>
</package>

Bottom line, once your file was opened in Sigil and saved it converts fine.