Kitaab-ul-Aathaar (كتاب الآثار) literally translates to "The Book of Traces" or "The Book of Narrations." It was compiled by the great Imam Muhammad ibn al-Hasan al-Shaybani (d. 189 AH), the student of Imam Abu Hanifah and Imam Malik.
school of jurisprudence, documenting the narrations, legal rulings, and practices of the early Muslim community, particularly the companions of the Prophet and their successors. Overview of the Work kitaab-ul-aathaar pdf