priceless, valuable, precious; see valuable 1. See syn. study at expensive.
"invaluable." YourDictionary, n.d. Web. 11 October 2018. <http://thesaurus.yourdictionary.com/invaluable>.
invaluable. (n.d.). Retrieved October 11th, 2018, from http://thesaurus.yourdictionary.com/invaluable
Of great value:
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