findng variant data on survexblocks and setting wallet *ref

templates/yearwallets.html

@@ -8,6 +8,7 @@
 plans and elevations. It also contains scans of centre-line survex output on which
 hand-drawn passage sections are drawn. These hand-drawn passages will eventually be 
 traced to produce Tunnel or Therion drawings and eventually the final complete cave survey.
+<p>Link to <a href="/expedition/{{year}}">logbooks and calendar for {{year}}</a>.
 
 {% include 'wallet_new.html' %}