Remove duplicate item

bib.bib

@@ -2249,7 +2249,6 @@
   author = {Lyon, Rod},
   editor = {Thomas, Peter W. and Williams, Derek R.},
   date = {2007},
-  pages = {??},
   publisher = {Francis Boutle Publishers},
   location = {London},
   keywords = {corn:factrev,cornish},
@@ -2299,12 +2298,12 @@
 }
 
 @book{Lyon2019,
-  title = {Colloquial doesn't mean corrupt},
+  title = {Colloquial doesn't mean corrupt: Observations on contemporary revived Cornish},
   author = {Lyon, Rod},
   date = {2019},
   publisher = {Evertype},
   location = {Dundee},
-  keywords = {corn:critrev2,cornish}
+  keywords = {corn:orth3,cornish}
 }
 
 @book{Payton1993,
@@ -2622,15 +2621,6 @@
   keywords = {corn:mc,cornish}
 }
 
-@book{Lyon2019a,
-  title = {Colloquial doesn't mean corrupt: Observations on contemporary revived Cornish},
-  author = {Lyon, Rod},
-  date = {2019},
-  publisher = {Evertype},
-  location = {Dundee},
-  keywords = {corn:orth3}
-}
-
 @incollection{Eska2020,
   title = {Prolegomena to the diachrony of Cornish syntax},
   booktitle = {Morphosyntactic variation in medieval Celtic languages},