15, 16. (a) How did we move ahead in our ministry during the 1920 s and 1930 s? ( b) What publications have given impetus to the Christian ministry in recent decades?
১৯২২ চনত সকলো যিহোৱাৰ সেৱকসকলক প্ৰচাৰ কাৰ্য্যত ভাগ লবলৈ উৎসাহিত কৰা হ’ল ।