Apart from the Srimad Bhagavatam and the Brahma Vaivarta Purana, is Goloka Vrindavana mentioned anywhere?
Yes, apart from Shrimada Bhagavatam 10.27.1, Goloka is mentioned in many scriptures. While Bhagavatam describes Goloka as a place where the celestial cow Surabhi resides, but some other scriptures describe Goloka as eternal abode of Lord Krishna.
In this way, O son of Kunti, assuming diverse forms do I rove at will through the Earth, the region of Brahma himself, and that other high and eternal region of felicity called Goloka. Mahabharata, Shanti Parva, SECTION CCCXLIII
'O goddess, at this exhibition of thy freedom from cupidity and desire and at these penances of thine, O thou of beautiful face, I have been exceedingly gratified. I, therefore, grant thee the boon of immortality. Thou shalt dwell in a region that is higher than the three worlds, through my grace. That region shall be known to all by the name of Goloka. Mahabharata, Anusha Parva, SECTION LXXXIII
Skanda Purana, Vol 7, Chapter 48 describes about Goloka in detail. Some excerpt are here:
Having successively crossed (the sheaths of) the elements, viz. earth, water, fire, wind, and ether, Ego (Aham), Mahat and Prakrti, each of which is ten times (larger) than the previous one, he arrived at the wonderful Goloka.
It was the glorious abode, accessible only to those exclusively devoted to Hari. While going he saw the extensively wide and fathomless river Viraja.
A detailed description of Goloka is mentioned in Brahma Vaivarta Purana, Vol 1, Chapter 2.
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