Science, Earth Sciences, Geology, Instruments and Supplies - Estwing. Manufacturer of hand-held striking and struck tools for geology and other uses (hammers, hoe-picks, chisels, axes, and pry bars).
Science, Earth Sciences, Geology, Instruments and Supplies - Contract Geological Services, Inc.. Equipment for exploration geology, including lots of field equipment, and some lab equipment.
Science, Earth Sciences, Geology, Instruments and Supplies - Brunton. Suppliers of the famous Brunton compass, and other equipment for outdoor research.