On the list of versions, the snapshots "13w16a" and "13w16b" are below 1.5.2 but all the research I've done says that those two snapshots came after 1.5.2.
[media]
MCL-13460
13w16a and 13w16b below 1.5.2 in update list
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1.5.2 was released on April 25, 2013. 13w16a was released on April 18 and 13w16b on April 23.