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BrickLink Reference Catalog
BrickLink Reference Catalog - Parts
BrickLink Reference Catalog - Minifigures
Sets | Brickset
LEGO Set Reference Inventories and Instructions
The LEGO Parts Guide - BRICK ARCHITECT
Understanding LEGO part numbers - Brickset
Help Topics - Customer Service - LEGO.com US
part identification - How are LEGO bricks categorized? - Bricks
r/lego on Reddit: Part Identification Mega Thread - Post all you ...