https://www.cadforum.cz/catalog_en/?q=Autocad+LT13
CAD Forum - CAD/BIM Library of free blocks - "Autocad LT13"
CAD Forum - CAD/BIM Library of free blocks - Autocad LT13 - free CAD blocks and symbols (DWG+RFA+IPT+F3D, 3D/2D) by ARKANCE
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