xxx
Array
(
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        (
            [id] => 1609
            [topology] => 4<sup>8</sup>T47
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            [shear_mod] => 416.9
            [vicker_hard] => 77.0
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            [publ_year] => 
            [ref] => 
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    [1] => Array
        (
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            [ref] => 
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xxx