The title "Dwarakadisha Krishna (Pastimes of Krishna in Dwaraka)" refers to a body of devotional and historical literature focusing on the life of Lord Krishna after he left his childhood home of Vrindavan and established his kingdom in the city of Dwaraka (also spelled Dwarka).
While there might be a specific "old book" with this exact title, the general content is derived from major Hindu scriptures, primarily the Tenth Canto of the Śrīmad-Bhāgavatam and the Mahābhārata.
"Dwarakadisha" means "Lord of Dwaraka." The tales of Krishna in this phase are distinct from his playful, intimate childhood lilas (pastimes) in Vrindavan, showcasing him in his role as a powerful king, statesman, and divine ruler (Aishvarya-lila).
The book would cover episodes such as:
This period of Krishna's life highlights his divine majesty and power (Aishvarya), contrasting with the intimate, sweet love (Madurya) of his earlier life in Vrindavan.