Yizkor book of Kock
Sefer Kotsk (Memorial Book of Kotsk), Editor: E. Porat, Commitee of Former Residents of Kotsk in Israel, Published: Tel Aviv 1961 (H, Y 424 pages)
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Read original book online in New York Public Library:
http://yizkor.nypl.org/index.php?id=1214
See English translations on JewishGen: