MB3 190b: Laws of Writing on Shabbos (340:4 - part 3)
MB3 190a: Laws of Writing on Shabbos (340:4 - part 2)
MB3 189b: Non-Permanent Writing on Shabbos (340:4 - part 1)
MB3 189a: Eating Cake or Taking Pills with Writing on Them on Shabbos (340:3)
MB3 188b: Removing Warts or Skin and Erasing Ink on Shabbos (340:2-3)