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Use this to find all the additional image sizes your site is using

/* Output all image sizes on the frontend
---------------------------------------------------------------------------------------------------- */	 
add_action('init', 'get_all_image_sizes');

function get_all_image_sizes(){
    global $_wp_additional_image_sizes; 
    print '<pre>'; 
    print_r( $_wp_additional_image_sizes ); 
    print '</pre>';
}