Phrases with «more concrete evidence»

As with any rumour, this one has to be taken with a pinch of salt for now until more concrete evidence surfaces. (pocket-lint.com)
Maybe you could edit it to replace «it is believed» by more concrete evidence / references? (politics.stackexchange.com)
But recent research offers more concrete evidence that investments in school libraries produce dividends in student achievement. (educationworld.com)
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