Śrīmad-Bhāgavatam · Text 12.2.35
Who is speaking and story frame
इत्येष मानवो वंशो यथा सङ्ख्यायते भुवि ।
तथा विट्शूद्रविप्राणां तास्ता ज्ञेया युगे युगे ॥ ३५ ॥
ity eṣa mānavo vaṁśo
yathā saṅkhyāyate bhuvi
tathā viṭ-śūdra-viprāṇāṁ
tās tā jñeyā yuge yuge
Thus I have described the royal dynasty of Manu, as it is known on this earth. One can similarly study the history of the vaiśyas, śūdras and brāhmaṇas living in the various ages.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.