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This site diehmandsons.com states the following, "SURVEYING, CIVIL ENGINEERING, LAND PLANNING - LANCASTER, PA." We observed that the website also said " We focus our expertise on traditional surveying methods, as well as electronic measuring, photogrammetric mapping and other state-of-the-art methods." It also stated " We service all aspects of civil engineering including stormwater management, erosion control plans, floodplain studies and highway occupancy permits. Turning your vision into reality. To see a sampling of our projects. Celebrating 130 Years of Service and Commitment." The header had pa land surveyors as the highest ranking keyword. It was followed by civil engineering pa, land surveying, and land mapping which isn't as ranked as highly as pa land surveyors. The next words the site used was photogrammetric mapping. stormwater management was also included but might not be viewed by search parsers.