diff --git a/lib/convert-worker.js b/lib/convert-worker.js
index 0b7a59c..a943d8f 100644
--- a/lib/convert-worker.js
+++ b/lib/convert-worker.js
@@ -236,6 +236,7 @@ function getBodyXML(chapter, book, contentEl) {
   xml = fixMispellings(xml);
   xml = fixHyphens(xml);
   xml = standardizeSpellings(xml);
+  xml = fixCaseNumbers(xml);
 
   // One-off fixes
   for (const substitution of substitutions[chapter.url] || []) {
@@ -563,6 +564,31 @@ function standardizeSpellings(xml) {
   return xml;
 }
 
+function fixCaseNumbers(xml) {
+  // Case numbers are very inconsistent. For "Case Fifty-Three", the breakdown is:
+  // * 9 Case-53
+  // * 6 Case 53
+  // * 2 case-53
+  // * 1 Case-Fifty-Three
+  // * 41 Case Fifty-Three
+  // * 1 Case Fifty Three
+  // * 13 Case fifty-three
+  // * 119 case fifty-three
+  // * 4 case-fifty-three
+  // * 1 case fifty three
+  // We standardize on "Case Fifty-Three"; although it isn't the most common, it seems best to treat these as proper
+  // nouns.
+
+  xml = xml.replace(/case[ -](?:fifty[ -]three|53)(?!’)/ig, "Case Fifty-Three");
+  xml = xml.replace(/case[ -](?:thirty[ -]two|53)(?!’)/ig, "Case Thirty-Two");
+  xml = xml.replace(/case[ -](?:sixty[ -]nine|53)(?!’)/ig, "Case Sixty-Nine");
+
+  xml = xml.replace(/(?<!in )case[ -](zero|one|two|three|four|twelve|fifteen|seventy|ninety)(?!-)/ig,
+    (_, caseNumber) => "Case " + caseNumber[0].toUpperCase() + caseNumber.substring(1));
+
+  return xml;
+}
+
 function isEmptyOrGarbage(el) {
   const text = el.textContent.trim();
   return text === "" ||
diff --git a/lib/substitutions.json b/lib/substitutions.json
index eb74acf..edab3e9 100644
--- a/lib/substitutions.json
+++ b/lib/substitutions.json
@@ -3723,10 +3723,6 @@
       "before": "I suspect It’s a",
       "after": "I suspect it’s a"
     },
-    {
-      "before": "Case Fifty-three",
-      "after": "case fifty-three"
-    },
     {
       "before": "reality,” Tattletale said. “What’s",
       "after": "reality,” Tattletale said, “what’s"
@@ -3751,10 +3747,6 @@
     }
   ],
   "https://parahumans.wordpress.com/2013/09/17/interlude-28/": [
-    {
-      "before": "Case fifty-threes",
-      "after": "case fifty-threes"
-    },
     {
       "before": "than,” Revel paused. “Six",
       "after": "than,” Revel paused, “six"
@@ -4045,14 +4037,6 @@
       "before": "gun build",
       "after": "gun built"
     },
-    {
-      "before": "hunchbacked Case fifty-three",
-      "after": "hunchbacked case fifty-three"
-    },
-    {
-      "before": "moved Case fifty-threes",
-      "after": "moved case fifty-threes"
-    },
     {
       "before": "I revoked my control over her, leaving in in the middle",
       "after": "I revoked my control over her, leaving her in the middle"