The Sports Turf Research Institute - STRI is the independent market leader in turfgrass research and agronomy. It is the UK's National Centre for consultancy in Sports and Amenity Turf and is recognised as a world centre for research. Putting-greens.com - Products and information for people interested in building a real bent grass putting green in the back yard. Based on the author's personal experience, using only hand tools and inexpensive materials. Golf Course Superintendents Association of America - Golf course management information, member areas, and a research section which covers requests for grant proposals, scientific database, and research reports on turfgrass cultivars, growing in putting greens, wildlife research, and physiology of bermudagrass, bentgrass, and ryegrass. Construction and Care of Croquet Lawns - Oxford University Croquet Club specifications on substrate layers, soil porosity, drainage pipes, and grass types, including contracting and materials cost and maintenance. With links to rules, ball mechanics, and rankings. The United States Golf Association: Course Care and Environment - Authoritative source of information on turfgrass management. Download papers on greens construction, irrigation, environmental protection, pesticides, and water. Proturf - Offers a wide range of turf suitable for gardens or sports pitches. Also offers screened top soil and a range of Scottish cobbles.