diff --git a/core/migrations/0020_auto__add_identifier__add_unique_identifier_type_value.py b/core/migrations/0020_auto__add_identifier__add_unique_identifier_type_value.py
index 4b58c6bb..ac61f195 100644
--- a/core/migrations/0020_auto__add_identifier__add_unique_identifier_type_value.py
+++ b/core/migrations/0020_auto__add_identifier__add_unique_identifier_type_value.py
@@ -22,29 +22,30 @@ class Migration(SchemaMigration):
         db.create_unique('core_identifier', ['type', 'value'])
         
         # migrating data
-        for work in orm.Work.objects.all():
-            if work.librarything_id:
-                identifier = orm.Identifier.objects.create(type='ltwk',value=work.librarything_id, work=work)
-                identifier.save()
-            if work.openlibrary_id:
-                identifier = orm.Identifier.objects.create(type='olwk',value=work.openlibrary_id, work=work)
-                identifier.save()
-            for edition in work.editions.all():
-                if edition.googlebooks_id:
-                    identifier = orm.Identifier.objects.create(type='goog',value=edition.googlebooks_id, work=work, edition=edition)
+        if not db.dry_run:
+            for work in orm.Work.objects.all():
+                if work.librarything_id:
+                    identifier = orm.Identifier.objects.create(type='ltwk',value=work.librarything_id, work=work)
                     identifier.save()
-                if edition.goodreads_id:
-                    identifier = orm.Identifier.objects.create(type='gdrd',value=edition.goodreads_id, work=work, edition=edition)
-                    identifier.save()
-                if edition.librarything_id:
-                    identifier = orm.Identifier.objects.create(type='thng',value=edition.librarything_id, work=work, edition=edition)
-                    identifier.save()
-                if edition.isbn_13:
-                    identifier = orm.Identifier.objects.create(type='isbn',value=edition.isbn_13, work=work, edition=edition)
-                    identifier.save()
-                if edition.oclc:
-                    identifier = orm.Identifier.objects.create(type='oclc',value=edition.oclc, work=work, edition=edition)
+                if work.openlibrary_id:
+                    identifier = orm.Identifier.objects.create(type='olwk',value=work.openlibrary_id, work=work)
                     identifier.save()
+                for edition in work.editions.all():
+                    if edition.googlebooks_id:
+                        identifier = orm.Identifier.objects.create(type='goog',value=edition.googlebooks_id, work=work, edition=edition)
+                        identifier.save()
+                    if edition.goodreads_id:
+                        identifier = orm.Identifier.objects.create(type='gdrd',value=edition.goodreads_id, work=work, edition=edition)
+                        identifier.save()
+                    if edition.librarything_id:
+                        identifier = orm.Identifier.objects.create(type='thng',value=edition.librarything_id, work=work, edition=edition)
+                        identifier.save()
+                    if edition.isbn_13:
+                        identifier = orm.Identifier.objects.create(type='isbn',value=edition.isbn_13, work=work, edition=edition)
+                        identifier.save()
+                    if edition.oclc:
+                        identifier = orm.Identifier.objects.create(type='oclc',value=edition.oclc, work=work, edition=edition)
+                        identifier.save()
                 
                
 
diff --git a/core/migrations/0021_auto__del_field_work_librarything_id__del_field_work_openlibrary_id__d.py b/core/migrations/0021_auto__del_field_work_librarything_id__del_field_work_openlibrary_id__d.py
index a70fba6d..ac33b9a4 100644
--- a/core/migrations/0021_auto__del_field_work_librarything_id__del_field_work_openlibrary_id__d.py
+++ b/core/migrations/0021_auto__del_field_work_librarything_id__del_field_work_openlibrary_id__d.py
@@ -54,28 +54,30 @@ class Migration(SchemaMigration):
         db.add_column('core_edition', 'librarything_id', self.gf('django.db.models.fields.CharField')(max_length=50, null=True), keep_default=False)
         
         # migrating data
-        for identifier in orm.Identifier.objects.all():
-            if identifier.type=='ltwk':
-                identifier.work.librarything_id = identifier.value
-                identifier.work.save()
-            elif identifier.type=='olwk':
-                identifier.work.openlibrary_id = identifier.value
-                identifier.work.save()
-            elif identifier.type=='goog':
-                identifier.edition.googlebooks_id = identifier.value
-                identifier.edition.save()
-            elif identifier.type=='gdrd':
-                identifier.edition.goodreads_id = identifier.value
-                identifier.edition.save()
-            elif identifier.type=='thng':
-                identifier.edition.librarything_id = identifier.value
-                identifier.edition.save()
-            elif identifier.type=='isbn':
-                identifier.edition.isbn_13 = identifier.value
-                identifier.edition.save()
-            elif identifier.type=='oclc':
-                identifier.edition.oclc = identifier.value
-                identifier.edition.save()
+        if not db.dry_run:
+
+            for identifier in orm.Identifier.objects.all():
+                if identifier.type=='ltwk':
+                    identifier.work.librarything_id = identifier.value
+                    identifier.work.save()
+                elif identifier.type=='olwk':
+                    identifier.work.openlibrary_id = identifier.value
+                    identifier.work.save()
+                elif identifier.type=='goog':
+                    identifier.edition.googlebooks_id = identifier.value
+                    identifier.edition.save()
+                elif identifier.type=='gdrd':
+                    identifier.edition.goodreads_id = identifier.value
+                    identifier.edition.save()
+                elif identifier.type=='thng':
+                    identifier.edition.librarything_id = identifier.value
+                    identifier.edition.save()
+                elif identifier.type=='isbn':
+                    identifier.edition.isbn_13 = identifier.value
+                    identifier.edition.save()
+                elif identifier.type=='oclc':
+                    identifier.edition.oclc = identifier.value
+                    identifier.edition.save()
 
 
     models = {