Classification of Hebrew collections

Letter	Sub heading
A-N	General works; Jewish history generally
P	Language
Q	Jewish literature generally; Bible
R	Rabbinic literature generally
RA-RD	Tannaitic literature; Mishnah; Talmud
RH	Halakhah
RM	Midrash
RN	Sermons
RP	Liturgy
RS	Mysticism
RT-RV	Jewish philosophy & ethics
S-T	Literary texts
W	Judaism
X	Arts & sciences in relation to Judaism