Yom Kippur.

Mishnayot Siyata Dishmaya : Yoma

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Nachala L'Yisrael al HaMoadim

Netivot Shalom / Maamrei Yamim Norayim (Netivei Tshuvah) - Slonimer Rebbe

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Nitei Gavriel - Halachot Rosh HaShanah & Yom Kippur (2 vol.)

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Otzar HaArizal : Yom Kippur

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Otzar ha-Segulot ve-Hakavanot L'Yamim Noraim

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Otzrot HaTorah - Ellul, Rosh HaShana & Yom Kippur

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Oz VeHadar's Mishnat HaMoadim : Asseret Yemei Teshuva

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Oz VeHadar's Mishnat HaMoadim : Yom Kippur

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Pachad Yitzchak al Yom Kippurim - Rabbi Yitzchak Hutner

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Peninei Yerach HaEitanim mi-Shulchan Gedolei Yerushalayim

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Piyutei Avodat Yom Hakippurim : Nefurashim & Mevoarim

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Pninei HaChassidut - Asseret Yemei Teshuva & Yom HaKippurim

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Rinat Yitzchak al Tefila : Moadim (Rabbi Avraham Yitzchak Sorotzkin)

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Sefat Emet - Yamim Norayim & Sukkot

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Sefer HaTodaah : Rabbi Eliyahu Kitov

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Shaar HaMelech al Moadei HaShanah : Rabbi Mordechai of Vilkatch

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Shaarei Armon - Meshalim L'Yamim Norayim

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Shaarei Arucha HaMevuar : Rabbi Yaakov Abuchatzeira

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She'elot U'Tshuvot Ohr L'Tzion : Volume #4

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Shefa Chaim - Shabbat Shuvah / 13 Middot / Yom Kippur (Klausenberg Rebbe)

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Shemateta De'Moshe - Rabbi Moshe Feinstien

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Shemen Rosh : Yamim Noraim #1 (R' Asher Anshel Katz)

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Shemen Rosh : Yamim Noraim #2 (R' Asher Anshel Katz)

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Shemot Ba'Aretz : Rabbeinu Moshe ben Chaviv

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Shulchan Aruch - Rosh Hashanah & Yom Kippur (Rabbi Shneur Zalman of Liadi)

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Sichot L'Yom HaKippurim - Rabbi Avigdor Neventzal

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Siddur Ha-AriZal- Kol Yaakov/ Rosh HaShanah & Yom Kippur (R' Yaakov Koppel)

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Siddur Rechovot HaNahar - Yom Kippur (Small Size - 5 vol.)

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Siftei Chaim - Moadim volume 1 (Rabbi Chaim Friedlander)