Tarkasaṃgraha, 1, 19.2 tac ca śuklanīlapītaraktaharitakapiśacitrabhedāt saptavidhaṃ pṛthivījalatejovṛtti /

Tarkasaṃgraha, 1, 19.3 tatra pṛthivyāṃ saptavidham /