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Caterpillar D9 - Wikipedia
D9 Dozer | Bulldozer | Cat | Caterpillar
Caterpillar | 1950s: Introducing the D9 Tractor & No. 6 Shovel
Caterpillar D9 - Wikimedia Commons
Caterpillar D9 Dozer History - The Working Man
The Cat® D9 Dozer: What a Tractor | Cat | Caterpillar
TractorData.com Caterpillar D9G tractor information
D9 Dozer | Bulldozer - Pon Cat
70 Years of the Cat D9 - earthmoversmagazine.co.uk