xxx
Array
(
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        (
            [id] => 1507
            [topology] => 4<sup>2</sup>T265
            [link_rcsr] => 
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            [shear_mod] => 421.1
            [vicker_hard] => 78.4
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
            [id] => 1508
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            [ref] => 
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)
xxx