The Kol Bo, based on an insight from Parshas Shelach, finds support for the custom of wearing shoes or other special clothing on Shabbos.
This source sheet gathers the relevant sources regarding this issue.
There is a separate question whether one needs to have a special pair of shoes for Shabbos. I include one Teshuva on this point as well.
This source sheet provides sources for the idea that the building of a Sukkah, itself is a Mitzvah. This was the underlying assumption of the Avnei Nezer in a Teshuvah. The assumption was heavily disputed by the Minchas Elazar.
When a descendant of a Concentration Camp survivor visits the Camp from which his/her ancestor was liberated are they permitted to make the Brocho that a miracle was performed for their ancestor at that place.
This Sheet collects the sources listed in the Responsa Kol Gadol Siman 26 by MOshe Ibn Chaviv discussing the permissibility of exporting seforim from Eretz Yisroel.
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This sheet gathers sources on the topic of how to count "Shloshim" (the 30th day) following a person's death. Because a number of mourning rituals and observances last for the Shloshim it is important to properly count the days. The two main options include counting from the day of death or counting from the day of burial.
This source sheet provides the relevant background for the Teshuvas Binyan Dovid Siman 58 (Link) authored by Rabbi Dovid Dov Beirish Meisels, the Av Beis Din of Ujhel.