diff --git a/core/models.py b/core/models.py
index 8082d6e..cd8db02 100644
--- a/core/models.py
+++ b/core/models.py
@@ -32,7 +32,11 @@ There are more subclasses define in models_caves.py models_survex.py etc.
 # This variable is a dictionary holding gloablly visible indexes and cache functions.
 # It is a Global Object, see https://python-patterns.guide/python/module-globals/
 # troggle.models.TROG
-TROG = {}
+TROG = {
+    'pagecache' : {
+        'expedition' : {}
+    }
+}
 
 def get_process_memory():
     usage=resource.getrusage(resource.RUSAGE_SELF)
diff --git a/core/views/logbooks.py b/core/views/logbooks.py
index 11ea3d6..4abb205 100644
--- a/core/views/logbooks.py
+++ b/core/views/logbooks.py
@@ -12,10 +12,9 @@ from django.template.defaultfilters import slugify
 from django.utils import timezone
 from django.views.generic.list import ListView
 
-import troggle.core.models as models
-import troggle.parsers.logbooks as logbookparsers
+#import troggle.parsers.logbooks as logbookparsers
 from troggle.core.forms import getTripForm  # , get_name, PersonForm
-from troggle.core.models import Expedition, Person, PersonExpedition
+from troggle.core.models import Expedition, Person, PersonExpedition, TROG
 from troggle.core.models_caves import LogbookEntry, PersonTrip
 from troggle.core.models_survex import SurvexBlock
 from .login import login_required_if_public
@@ -24,6 +23,11 @@ from troggle.parsers.people import GetPersonExpeditionNameLookup
 
 import troggle.settings as settings
 
+'''These views are for logbook items when they appear in an 'expedition' page
+and for persons: their individual pages and their perseonexpedition pages.
+
+It uses the global object TROG to hold some cached pages.
+'''
 
 def getNotablePersons():
     notablepersons = []
@@ -51,7 +55,27 @@ def personindex(request):
 
 
 def expedition(request, expeditionname):
+    '''Returns a rendered page for one expedition, specified by the year e.g. '2019'.
+    If page caching is enabled, it caches the dictionaries used to render the template page.
+    
+    The cache is refreshed if '?reload' is present in the requesting URL, which also re-parses the logbook.
+    By specifying a '0' for the expected number of entries in the logbook cache, this forces the parser to
+    re-parse the original logbook HTML file.
+    '''
+    if "reload" in request.GET:
+        this_expedition = Expedition.objects.get(year=int(expeditionname))
+        LoadLogbookForExpedition(this_expedition, 0)
+
+    ts = TROG['pagecache']['expedition']
+    if settings.CACHEDPAGES:
+        nexpos = len( TROG['pagecache']['expedition'])
+        #print(f'! - expo {expeditionname} CACHEDPAGES {nexpos} expo pages in cache.')           
+        if expeditionname in ts:
+            #print('! - expo {expeditionanme} using cached page')           
+            return render(request,'expedition.html', ts[expeditionname] )
+                    
     this_expedition = Expedition.objects.get(year=int(expeditionname))
+
     expeditions = Expedition.objects.all()
     personexpeditiondays = [ ]
     dateditems = list(this_expedition.logbookentry_set.all()) + list(this_expedition.survexblock_set.all())
@@ -66,9 +90,14 @@ def expedition(request, expeditionname):
             prow.append(pcell)
         personexpeditiondays.append({"personexpedition":personexpedition, "personrow":prow})
         
-    if "reload" in request.GET:
-        LoadLogbookForExpedition(this_expedition)
-    return render(request,'expedition.html', {'expedition': this_expedition, 'expeditions':expeditions, 'personexpeditiondays':personexpeditiondays, 'settings':settings, 'dateditems': dateditems })
+    
+    ts[expeditionname] = {'expedition': this_expedition, 'expeditions':expeditions, 
+        'personexpeditiondays':personexpeditiondays, 'settings':settings, 
+        'dateditems': dateditems }
+    TROG['pagecache']['expedition'][expeditionname] = ts[expeditionname]
+    nexpos = len( TROG['pagecache']['expedition'])
+    #print(f'! - expo {expeditionname}  pre-render N expos:{nexpos}')           
+    return render(request,'expedition.html', ts[expeditionname] )
 
 
 def get_absolute_url(self):