Correct inconsistency

bib.bib

@@ -108,6 +108,16 @@
   file = {C:\Users\3055822\OneDrive - Queen's University Belfast\readings\ellis 1974 notes.rtf}
 }
 
+@book{BerresfordEllis1974a,
+  title = {The story of the Cornish language},
+  author = {Berresford Ellis, Peter},
+  date = {1974},
+  publisher = {Tor Mark Press},
+  location = {Truro},
+  keywords = {corn:gen,cornish},
+  file = {C:\Users\3055822\OneDrive - Queen's University Belfast\readings\ellis 1974a.pdf}
+}
+
 @article{Betcher1996,
   title = {A reassessment of the data and provenance of the Cornish {\emph{Ordinalia}}},
   author = {Betcher, G. J.},
@@ -749,25 +759,6 @@
   keywords = {corn:mc,cornish}
 }
 
-@book{Ellis1974,
-  title = {The Cornish language and its literature},
-  author = {Ellis, Peter Berresford},
-  date = {1974},
-  publisher = {Routledge},
-  location = {London},
-  keywords = {corn:gen,cornish}
-}
-
-@book{Ellis1974a,
-  title = {The story of the Cornish language},
-  author = {Ellis, Peter Berresford},
-  date = {1974},
-  publisher = {Tor Mark Press},
-  location = {Truro},
-  keywords = {corn:gen,cornish},
-  file = {C:\Users\3055822\OneDrive - Queen's University Belfast\readings\ellis 1974a.pdf}
-}
-
 @incollection{Eska2020,
   title = {Prolegomena to the diachrony of Cornish syntax},
   booktitle = {Morphosyntactic variation in medieval Celtic languages},
@@ -1453,7 +1444,7 @@
   pages = {307--312},
   publisher = {University of Exeter Press},
   location = {Exeter},
-  keywords = {corn,corn:factrev}
+  keywords = {corn:factrev,cornish}
 }
 
 @incollection{Hale2006,
@@ -1797,7 +1788,7 @@
   title = {An English-Cornish dictionary},
   author = {Jago, Frederick W. P.},
   date = {1887},
-  publisher = {Simpkin, Marshall and Co.},
+  publisher = {{Simpkin, Marshall and Co.}},
   location = {London},
   keywords = {corn:altmat,cornish},
   file = {C\:\\Users\\3055822\\OneDrive - Queen's University Belfast\\readings\\jago 1887 notes.rtf;C\:\\Users\\3055822\\OneDrive - Queen's University Belfast\\readings\\jago-1887.pdf}
@@ -2195,7 +2186,7 @@
 }
 
 @article{Maber1979,
-  title = {Celtic prosody in late Cornish: the {{{\emph{englyn}}}} ``An lavar k\^oth yu lavar gu\^{\i}r''},
+  title = {Celtic prosody in late Cornish: the {{{\emph{englyn}}}} ``An lavar k\^oth yu lavar gu\^ir''},
   author = {Maber, R. G.},
   date = {1979},
   journaltitle = {Bulletin of the Board of Celtic Studies},
@@ -2226,7 +2217,7 @@
 
 @incollection{MacKinnon2004,
   title = {``As Cornish as possible'' -- ``Not an outcast anymore'': Speakers' and learners' opinions on Cornish},
-  booktitle = {Cornish Studies: Twelve},
+  booktitle = {Cornish studies: Twelve},
   author = {MacKinnon, Kenneth},
   editor = {Payton, Philip},
   date = {2004},
@@ -3450,7 +3441,7 @@
   title = {The Cornish language in education in the UK},
   author = {Sayers, Dave and Davies-Deacon, Merryn and Croome, Sarah},
   date = {2019},
-  institution = {Mercator European Research Centre on Multilingualism and Language Learning},
+  institution = {{Mercator European Research Centre on Multilingualism and Language Learning}},
   location = {Leeuwarden},
   keywords = {corn:pol,cornish},
   file = {C:\Users\3055822\OneDrive - Queen's University Belfast\readings\sayers davies-deacon & croome 2019.pdf}
@@ -3526,7 +3517,7 @@
   pages = {98--125},
   publisher = {University of Exeter Press},
   location = {Exeter},
-  keywords = {corn,corn:factrev}
+  keywords = {corn:factrev,cornish}
 }
 
 @incollection{Spriggs2010,
@@ -3669,8 +3660,8 @@
 @book{Thorn1979,
   title = {Cornwall},
   editor = {Thorn, C. and Thorn, F.},
-  editorb = {Morris, J.},
-  editorbtype = {redactor},
+  editora = {Morris, J.},
+  editoratype = {redactor},
   date = {1979},
   series = {Domesday Book},
   volume = {10},