Kitab al-Athar of Imam Abu Hanifah
This collection from imam Muhammad RA of the over 900 reports narrated by hazrat Abu Hanifah RA is a great early generation collections of ahadith. You will notice there isnt the system of isnaad similar to muwatta shareef of hazrat Imam Malik RA. The book also establishes the often misunderstood expertise of the Ahnaf in hadith and its amazing analogical and hadith application skills. It is an excellent book, a must have for any student engaging Hanafi school. Obviously it also contains the verdicts of hazrat Imam Muhammad RA. I find the book well organised and easy to understand being novice in deen studies.