- unitid
-
{"value"=>"1093116", "type"=>"local_mss"}
- unitdate
-
{"value"=>"1787-1791", "type"=>"inclusive", "normal"=>"1787/1791"}
- date_inclusive_start
-
1787
- date_inclusive_end
-
1791
- keydate
-
1787
- date_start
-
1787
- date_end
-
1791
- unittitle
-
{"value"=>"William Hackett, papers relating to the ship Massachusetts"}
- note
-
{"value"=>"See: \"Papers relating to the building of the ship Massachusetts, at Braintree, 1787, Essex Institute Historical Collections, Vol. LXXIV, July, 1938."}