Midrash HaGadol (10 volumes)

Written by Rabbi David ben Amram Adani of Aden in Saudi Arabia (late 13th century).
This midrashic work incorporates many midrashim from Chazal. Its unique because it includes midrashim halachot and agadah, which were lost throughout the years.
The author also sometimes presents ma'amarim from Talmud and Midrash in a different version, and in many cases the author kept for us the original old version of the books of Chazal.
The book was recognized by known researches.