Give this a try:
<table>
<$list filter="[tag[Ebook]has[vendor]each[vendor]get[vendor]sort[]]">
<$list filter="[tag[book]has[vendor]field:vendor<currentTiddler>
sort[author]]">
<tr>
<td>
//<$link to={{!!title}}><$view field="title"/></$link>//
</td>
<td>
<$view field='author'/>
</td>
<td>
<$view field='vendor'/>
</td>
</tr>
</$list>
</$list>
</table>
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