Can anyone point me towards studies on Christian missionary activity in the Persian Gulf in the 19th century? I am especially interested in written Arabic literature that was circulated in the effort to convert Muslims and/or written responses in Arabic to those polemics. I am especially interested in an polemic aimed at Muslims called Miftāḥal-Khazā’in wa-Miṣbāḥal-Dafā’in and a Muslim response that carries the title Thamarāt Lubb al-Albāb.