Image courtesy courtesy Richard Palmer blog. Attribution not provided.
Cobblestone Info Base Index of Cobblestone Structures listed in the National Register of Historic Places.
Historic Places - Search historic places and landmarks in the USA
List by county of Historical Markers in New York State, Wikipedia
National Register Content and Copyright
National Register Database and Research
National Register of Historic Places "Multiple Property Documentation Form", Cobblestone Architecture of New York State
NP Gallery Digital Asset Management System, Digital Archive on NPGallery, Digital Asset Search for National Register of Historic Places
Wikipedia: List of Cobblestone structures on the National Register of Historic Places by state
Wikipedia: WikiProject National Register of Historic Places - Style guide
Wisconsin Historical Society Register of Historical Places
"Cobblestone Architecture", by Carl F. Schmidt 1944. Html Info Base version.
The book does not have a table of contents or an index.
"Cobblestone Masonry", by Carl F. Schmidt 1966.