Erik P. Conard has sent this information on the Upshur Burr Family
The Vital Records of most MA towns have been printed to 1850, no other state has such completed data, published.
Charles Burr Todd wrote three editions of "The Burr Family in America". Yours likely in it.
Chauncey Rea Burr wrote a history of the Dorchester (MA) branch. It is quite rare but I do have a copy, #66
I feel certain you will complete many lines