Index page of posts tagged with two separate taxonomies

Question

This is very similar to this question.

Try something like this in your template and change the AND condition to AND/OR as appropriate depending on what combination you want.

$args = array(
'post_type' => 'Book',
'tax_query' => array(
    'relation' => 'AND',
    array(
        'taxonomy' => 'Genre',
        'field' => 'slug',
        'terms' => array( 'Fiction' )
    ),
    array(
        'taxonomy' => 'Media Type',
        'field' => 'slug',
        'terms' => array( 'eBook' )
    )
)
);
$query = new WP_Query( $args );