Yes.

bibliography.bib

@@ -5,7 +5,7 @@
     editor = {New England Historic Genealogical Society},
     year = {1908},
     publisher = {New England Historic Genealogical Society},
-    address = {Boston, MA},
+    address = {Boston, Massachusetts},
     volume = {9},
     pages = {103--105},
 }
@@ -48,7 +48,7 @@
     title = {These Truths: A History of the United States},
     year = {2018},
     publisher = {W. W. Norton \& Company, Inc.},
-    address = {New York, N.Y.},
+    address = {New York City, New York},
     annote = {Review: https://www.jstor.org/stable/10.2979/indimagahist.115.4.08.}
 }
 
@@ -76,3 +76,33 @@
     year = {1998},
     annote = {From a peer reviewed academic journal, on JSTOR.},
 }
+
+% https://archive.org/details/theoryartofbread00hors/
+@book{HorsBread61,
+    author = {Eben Norton Horsford},
+    title = {The Theory and Art of Bread-Making. A New Process Without the use of Fermet},
+    year = {1861},
+    publisher = {Welsh Bigelow \& Co.},
+    address = {Cambridge, Massachusetts},
+    annote = {A primary source, written by Horsford.}
+}
+
+% https://archive.org/details/problemofnorthme00hors/page/n9/mode/2up
+@book{HorsProb89,
+    author = {Eben Norton Horsford},
+    title = {The Problem of the Northmen},
+    year = {1889},
+    publisher = {John Wilson and Son},
+    address = {Cambridge, Massachusetts},
+    annote = {A primary source, written by Horsford.}
+}
+
+% https://archive.org/details/discoveryofameri00hors/page/n9/mode/2up?ref=ol&view=theater
+@book{HorsDisc87,
+    author = {Eben Norton Horsford},
+    title = {Discovery of America by Northmen},
+    year = {1888},
+    publisher = {The Riverside Press},
+    address = {Cambridge, Massachusetts},
+    annote = {A primary source, originally delivered orally by Horsford at the dedication of a statue of Lief Ericson in Faneuil Hall, 1887.}
+}