New answers tagged rendering
Your question isn't 100% clear but I assume you want to create map sets based on your 50 vector layers. This is quite easy using Atlas in QGIS. There used to be a brilliant plugin for creating the coverage layer for Atlas but that has not been ported to QGIS 2 sadly. However, it sounds as if you know your xmin, ymin, xmax, ymax extents for the 30 maps, so ...
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