Deere & Company (NYSE: DE) stock is up more than 80% in the last three years, but investors shouldn't start thinking about selling just yet. The company's first-quarter results were a positive, and earnings at companies like Caterpillar Inc. (NYSE: CAT) had some encouraging signs for its non-agricultural segments. Deere shares have room to run -- here are three reasons why.Image source: Getty Images.Deere generated nearly 70% of its operating profit from its agriculture and turf segment. Around 60% of the segment's equipment sales come from North America -- in turn half of equipment sales go to the large agricultural machinery market.Continue reading