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International Bibliography of Theology and Religious Studies
RB Church office; congregation 30,857
RC Liturgy 23,130
RF Christian education; catechetics 20,822
RJ Mission; missiology 17,842
RG Pastoral care 13,384
RE Homiletics 10,545
RD Hymnology 7,182
RA Practical theology 7,159
RK Charity work 6,861
RH Evangelization; Christian media 6,533