How To Duplicate Objects Around A Circle - BlenderNation
How to copy and paste in Blender - Quora
Duplication — Blender Manual
Blender Duplicate and Separate add-on
GitHub - QCPolmer/Blender-3d-remove-duplicate-materials-in-scene: Run this script from a scene and it will replace all materials with a '.001' or whatever with the material without the number after it. Basically, it is for