Group of [7] Books by the Avnei Nezer of Sochachov, Son-in-Law and Disciple of the Saraf of Kotzk. First Editions

Group of [7] Books by the Avnei Nezer of Sochachov, Son-in-Law and Disciple of the Saraf of Kotzk. First Editions
* Avnei Nezer, responsa. Geonic book by the Admo"r Rabbi Avraham Borenstein of Sochachov, known by the name of his book, as "Ba'al HaAvnei Nezer." First edition. Six volumes.
Before us are the six volumes as they appear in Stefasky's bibliography (without the Choshen Mishpat section, which was printed during a later period by the author's grandson).
[1]: Orach Chaim, Part I. Petrikov, 1912. [1], 317 pages. Foreword at the beginning of the book by the author's son, the Admo"r Rabbi Shmuel of Sochochov, author of Shem MiShmuel, who arranged the book.
[2]:ֲ Orach Chaim, Part II. Petrikov, 1912. [1], 312 pages.
[3]: Yoreh Deah, Part I. Warsaw, 1913. 226 pages.
[4]: Yoreh Deah, Part II. Warsaw, 1914. 131 [should be 331] pages.
[5]: Even HaEzer, Part I. Lodz, 1926. 259 pages.
[6]: Even HaEzer, Part II. Novellae on tractates Ketubot, Gittin and Kiddushin at the book's end. Petrikov, 1926. 286 pages.
* Eglei Tal - elucidation on halachahs of Shabbat starting with the 11 melachot involved in bread, accompanied by the melachah of shearing, by Rabbi Avraham Borenstein [the Admo"r of Sochachov]. Petrikov, 1905. First edition. [3], 138 [1] leaves.
This is one of the most important books on the laws of Shabbat. It features an important preface in which the author writes about his study method, as he learned from his father-in-law, the Saraf of Kotzk. At the end of the preface, the author writes that his son, R' Shmuel [the Admo"r, author of Shem MiShmuel of Sochachov], was the one who arranged the book. "Part I" is written on the title page, but there were no other parts printed. The book became famous quickly, and many yeshivahs in Poland started studying tractate Shabbat during that period.
The gaon Rabbi Avraham Borenstein [1839-1910] was the first Admo"r of Sochachov, one of the leading geonim and tzaddikim of his generation. He was a son-in-law of the gaon Rabbi Menachem Mendel, the Saraf of Kotzk. He served as Admo"r to thousands of Chassidim, aside from being a renowned adjudicator. Rabbi Avraham also served as a rosh yeshivah, endowing his disciples with his special study method. Many of Poland's geonim were his close disciples. His books are among the foundational works in the world of scholarly Torah study and halachah.
Stefansky, Sifrei Yesod 315. Various sizes. Overall fine condition. Owners' signatures and stamps: Rabbi Shmuel Weingart - his disciple - and others.