diff --git a/index.php b/index.php
index 4fd3560..3e04e78 100644
--- a/index.php
+++ b/index.php
@@ -104,6 +104,12 @@
 						</label><span class="far fa-question-circle icon-sm" data-placement="right" data-toggle="tooltip" title="Search by author"></span>
 						<input id="author" name="author" class="form-control" placeholder="Gail Simone" />
 					</div>
+					<div class="form-group">
+						<label>
+							Call Number<br>
+						</label><span class="far fa-question-circle icon-sm" data-placement="right" data-toggle="tooltip" title="Search by call number - wildcards accepted"></span>
+						<input id="callnumber" name="callnumber" class="form-control" placeholder="Examples: 005.72 or 921.*" />
+					</div>
 					<div class="form-group">
 						<label>
 							Subject Heading<br>
diff --git a/yourlink.php b/yourlink.php
index 1467261..1cd2774 100644
--- a/yourlink.php
+++ b/yourlink.php
@@ -3,21 +3,33 @@
 // Variable intake and sanitization
 $incomingurl = $_POST['url'];
 $url = filter_var($incomingurl, FILTER_SANITIZE_URL);
+
 $incomingctx = $_POST['ctx'];
 $ctx = filter_var($incomingctx, FILTER_SANITIZE_STRING);
+
 $incomingkeywords = $_POST['keywords'];
 $keywords = filter_var($incomingkeywords, FILTER_SANITIZE_STRING);
+
 $language = filter_input(INPUT_POST, 'language', FILTER_SANITIZE_STRING);
+
 $incomingtitle = $_POST['title'];
 $title = filter_var($incomingtitle, FILTER_SANITIZE_STRING);
+
 $incomingsubject= $_POST['subject'];
 $subject = filter_var($incomingsubject, FILTER_SANITIZE_STRING);
+
 $incomingauthor = $_POST['author'];
 $author = filter_var($incomingauthor, FILTER_SANITIZE_STRING);
+
+$incomingcallno = $_POST['callnumber'];
+$callnumber = filter_var($incomingcallno, FILTER_SANITIZE_STRING);
+
 $incomingmaterial = $_POST['material'];
 $material = filter_var($incomingmaterial, FILTER_SANITIZE_STRING);
+
 $incomingcollection = $_POST['collection'];
 $collection = filter_var($incomingcollection, FILTER_SANITIZE_STRING);
+
 $incomingtom = filter_input(INPUT_POST, 'tom', FILTER_SANITIZE_STRING);
 
 
@@ -44,6 +56,10 @@ if (!empty($author)) {
     $au = $searchjoiner.'au='.$author;
 }
 
+if (!empty($callnumber)) {
+    $call = $searchjoiner.'call='.$callnumber;
+}
+
 if (!empty($material)) {
     $mat = $searchjoiner.'mat='.$material;
 }
@@ -63,7 +79,7 @@ if (!empty($title)) {
     $urlend = $searchsuffix;
 }
 
-$SearchURL = implode("", array_filter(array($url, $searchprefix, $ctx, $searchmiddle, $la, $au, $kw, $su, $mat, $col, $tom, $urlend)));
+$SearchURL = implode("", array_filter(array($url, $searchprefix, $ctx, $searchmiddle, $la, $au, $call, $kw, $su, $mat, $col, $tom, $urlend)));
 
 ?>
 
@@ -157,6 +173,7 @@ $SearchURL = implode("", array_filter(array($url, $searchprefix, $ctx, $searchmi
                     echo '<strong>Keyword(s):</strong> '.$keywords.'<br />';
                     echo '<strong>Title:</strong> '.$title.'<br />';
                     echo '<strong>Author:</strong> '.$author.'<br />';
+                    echo '<strong>Call:</strong> '.$callnumber.'<br />';
                     echo '<strong>Subjects:</strong> '.$subject.'<br />';
                     echo '<strong>Material Type Code:</strong> '.$material.'<br />';
                     echo '<strong>Collection Code:</strong> '.$collection.'<br />';