citefind: a bibliography is not a page of notes, however its lines begin

Mellor, Hugh (1974) "In Defense of Dispositions," Philosophical Review 83:157-
    81. Reprinted in Mellor (1991):104-22.

`81.` there is the second half of a page range whose first line ran out of
room. It is also, at the start of a line, exactly what a note marker looks
like — and two of them on a page of twenty-three references were enough to
send the whole page down the numbered-notes path, where it was cut into two
enormous entries and both were thrown away for running past a hundred and
twenty words.

Heil's *Philosophy of Mind* came out of the corpus with one citation. The
page above gives nineteen.

The two readings are now weighed against each other: more lines opening on a
surname and a comma than there are note markers means it is a bibliography.
A real page of notes has many markers and no line that opens on a surname,
because every line opens on its number.

Over the 202 reference sections sampled from the corpus: 10,047 to 10,405.

crates/citefind/src/split.rs

@@ -130,7 +130,16 @@ static ID_MARKER: LazyLock<Regex> =
 /// Cut a block into entries.
 pub fn entries(text: &str) -> Vec<Entry> {
     let numbered = numbered_notes(text);
-    let cut = match numbered.len() >= MIN_NOTES {
+    // A bibliography is not a page of notes, however many of its lines begin
+    // on a number. `81. Reprinted in Mellor (1991):104-22.` is the second
+    // line of an entry whose first line ran out of room, and two of those on
+    // a page of twenty-three references used to cut the page in two and
+    // throw both halves away for running on.
+    let surnames = text
+        .lines()
+        .filter(|line| SURNAME_FIRST.is_match(line.trim_start()))
+        .count();
+    let cut = match numbered.len() >= MIN_NOTES && numbered.len() >= surnames {
         true => numbered,
         false => unnumbered(text),
     };
@@ -431,6 +440,33 @@ mod tests {
         assert!(found[0].text.starts_with("John Smith"), "{:?}", found[0]);
     }
 
+    #[test]
+    fn a_line_of_a_bibliography_that_begins_on_a_number_is_not_a_note() {
+        // `81. Reprinted in Mellor (1991):104-22.` is the second line of an
+        // entry whose first line ran out of room. Two of those on a page of
+        // references used to cut the page into two enormous entries.
+        let page = "\
+Martin, C.B. and Heil, John (forthcoming) \u{201c}Rules and Powers,\u{201d} Philosophical
+             Perspectives.
+             Mele, Alfred R. (1987) Irrationality: An Essay on Akrasia, New York: Oxford.
+             Mellor, Hugh (1974) \u{201c}In Defense of Dispositions,\u{201d} Philosophical Review 83:157-
+             81. Reprinted in Mellor (1991):104-22.
+             Mellor, Hugh (1991) Matters of Metaphysics, Cambridge: Cambridge University
+             Press.";
+        let found = entries(page);
+        assert!(found.len() >= 4, "{found:#?}");
+        assert!(
+            found.iter().any(|e| e.text.starts_with("Mele")),
+            "{found:#?}"
+        );
+        assert!(
+            found
+                .iter()
+                .any(|e| e.text.starts_with("Mellor, Hugh (1991)")),
+            "{found:#?}"
+        );
+    }
+
     #[test]
     fn a_note_that_cites_nothing_is_not_a_reference() {
         let page = "\