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diff --git a/ccl/cclptree.c b/ccl/cclptree.c
new file mode 100644
index 0000000..39abaf6
--- /dev/null
+++ b/ccl/cclptree.c
@@ -0,0 +1,79 @@
+/* CCL print rpn tree - infix notation
+ * Europagate, 1995
+ *
+ * $Log: cclptree.c,v $
+ * Revision 1.1  1995-04-10 10:28:20  quinn
+ * Added copy of CCL.
+ *
+ * Revision 1.5  1995/02/23  08:31:59  adam
+ * Changed header.
+ *
+ * Revision 1.3  1995/02/15  17:42:16  adam
+ * Minor changes of the api of this module. FILE* argument added
+ * to ccl_pr_tree.
+ *
+ * Revision 1.2  1995/02/14  19:55:11  adam
+ * Header files ccl.h/cclp.h are gone! They have been merged an
+ * moved to ../include/ccl.h.
+ * Node kind(s) in ccl_rpn_node have changed names.
+ *
+ * Revision 1.1  1995/02/14  10:25:56  adam
+ * The constructions 'qualifier rel term ...' implemented.
+ *
+ */
+
+#include <stdio.h>
+#include <assert.h>
+#include <string.h>
+
+#include <ccl.h>
+
+void ccl_pr_tree (struct ccl_rpn_node *rpn, FILE *fd_out)
+{
+
+    switch (rpn->kind)
+    {
+    case CCL_RPN_TERM:
+	fprintf (fd_out, "\"%s\"", rpn->u.t.term);
+        if (rpn->u.t.attr_list)
+        {
+            struct ccl_rpn_attr *attr;
+            for (attr = rpn->u.t.attr_list; attr; attr = attr->next)
+                fprintf (fd_out, " %d=%d", attr->type, attr->value);
+        }
+	break;
+    case CCL_RPN_AND:
+	fprintf (fd_out, "(");
+	ccl_pr_tree (rpn->u.p[0], fd_out);
+	fprintf (fd_out, ") and (");
+	ccl_pr_tree (rpn->u.p[1], fd_out);
+	fprintf (fd_out, ")");
+	break;
+    case CCL_RPN_OR:
+	fprintf (fd_out, "(");
+	ccl_pr_tree (rpn->u.p[0], fd_out);
+	fprintf (fd_out, ") or (");
+	ccl_pr_tree (rpn->u.p[1], fd_out);
+	fprintf (fd_out, ")");
+	break;
+    case CCL_RPN_NOT:
+	fprintf (fd_out, "(");
+	ccl_pr_tree (rpn->u.p[0], fd_out);
+	fprintf (fd_out, ") not (");
+	ccl_pr_tree (rpn->u.p[1], fd_out);
+	fprintf (fd_out, ")");
+	break;
+    case CCL_RPN_SET:
+	fprintf (fd_out, "set=%s", rpn->u.setname);
+	break;
+    case CCL_RPN_PROX:
+	fprintf (fd_out, "(");
+	ccl_pr_tree (rpn->u.p[0], fd_out);
+	fprintf (fd_out, ") prox (");
+	ccl_pr_tree (rpn->u.p[1], fd_out);
+	fprintf (fd_out, ")");
+	break;
+    default:
+	assert (0);
+    }
+}