Shavuot.

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Maayan HaMoed : Sefirat HaOmer, Lag BaOmer, Shavuot, Ruth

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Machzor Hodaya B'Chavana : Shavuot (Nusach Sefaradi)

Machzor Kol Yaakov / Ashkenaz - (medium size - 5 vol.)

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Machzor Sepharadi : Avodat HaShem - (5 vol. set)

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Machzor Sepharadi : Le'Maan Shmo B'Ahava (5 vol. set)

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Machzor Sepharadi : Shaarei Yerushalayim (5 vol. set)

Matnat Chaim : Moadim (Harav Matityahu Chaim Solomon)

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Megillat Esther & Ruth - Peirush Malbim

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Megillat Esther Peirush Maamar Esther / Megillat Ruth & Eicha Peirush Lakachat Musar

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Meorei HaMoadim mi'Beit Brisk

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Merapsin Igrai : Moadim (Kushiyot & Terutzim)

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Messilot b'Or HaChassidut : Moadim vol. #2

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Midrash Zuta : Shir HaShirim, Ruth, Eicha, Koheleth

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Mikraot Gedolot - Hamaor : Chamesh Megillot

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Mi'Mishnato shel Ramchal : Pesach thru Shavuot (Rabbi Chaim Friedlander)

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Mishbetzot Zahav al Megillat Ruth

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Moadei HaAri - Pesach Omer & Shavuot

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Netivei Or - Pesach & Shavuot (Rabbi Nissim Yagen)

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Nitei Gavriel - Halachot Shavuot & Minhagei Chodesh Sivan

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Ohel Moed : Maamarim b'Inyanei HaMoadim b'Mishnat HaAri v'HaGra

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Osef Amarim al Torah Shavuot/Matan Torah : Rabbi Yaakov Meir Shechter

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Otzar HaArizal : Shavuot

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Otzar HaArizal : Tikkun Leil Shavuot

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Otzar HaMidrashim : Megillat Ruth & Tikkun Leil Shavuot

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Otzar Midrashei Ruth

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Otzar Perushei Baalei HaTosfot - Shir HaShirim & Ruth

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Otzar Perushei Baalei HaTosfot : Yitro & Mishpatim (vol. #8)

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Otzrot HaTorah - Sefirat HaOmer, Lag BaOmer & Shavuot

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Oz VeHadar's Mishnat HaMoadim : Shavuot

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Pachad Yitzchak al Shavuot - Rabbi Yitzchak Hutner