CREATE TABLE table_name_27 (buechel_ VARCHAR(255), _manhart_spelling__pronunciation_ VARCHAR(255), dakota_mission VARCHAR(255), deloria_ VARCHAR(255), _boas VARCHAR(255))
Deloria & Boas of ų, and a Dakota Mission of un had what Buechel & Manhart spelling (pronunciation)?
    
SQL: SELECT buechel_ & _manhart_spelling__pronunciation_ FROM table_name_27 WHERE deloria_ & _boas = "ų" AND dakota_mission = "un"