<div class="moreContent">
<?php
$paged = 1;
if ( get_query_var('paged') ) $paged = get_query_var('paged');
if ( get_query_var('page') ) $paged = get_query_var('page');
$previousYear = "";

$wp_query = new WP_Query();
$wp_query->query(array(
        'paged' => $paged,
        'post_type' => 'covers',
        'posts_per_page' => 50,
        'meta_key' => 'custom_issueYear',
        'orderby' => 'custom_issueYear',
        'order' => 'ASC',
        'meta_query' => array(
                    array(
                    'key' => 'custom_issueYear',
                    'value' => array(1932, 1959),
                    'type' => 'numeric',
                    'compare' => 'BETWEEN'))
));?>


<?php if ($wp_query->have_posts()) : while ($wp_query->have_posts()) : $wp_query->the_post();
$issueYear = get_post_meta($post->ID, 'custom_issueYear', true);
$currentYear = $issueYear ?>

    <?php if($currentYear != $previousYear) : ?>
        <h5><?php echo $currentYear; ?></h5>
        <?php $previousYear = $currentYear; ?>
    <?php endif; ?>

    <div class="thumbNail" ><!-- Start thumbNail -->
            <figure>
            <?php the_post_thumbnail(); ?>
        </figure>
    </div><!-- End thumbNail -->
<?php endwhile; endif;?>
<?php wp_reset_postdata();?>
</div>