In 1952 the famous Sefer Taharas Yisroel on laws of family purity was published in America for the first time. It was published by Rav
Yehuda Tropper Zt"l. Since then it was published 10 more times.
The author of the Taharas Yisroel received various haskamos. Mongst them is a Haskama from Maran Rav Chaim Halevi of Brisk Zt"l.
The author also left unprinted a Sefer called "Kuntres Hateshuvos" on 4 Chelkei Shulchan Aruch. This Sefer was recently published by R' Leib Tropper, founder of Yeshivas Kol Yaakov in Memory, of his most respected father.
This new Sefer with notes and comments from the publisher seems to be turning into a best seller.
Lehagdil Torah U'lahadira