The National Air Transportation Association (NATA) recently purchased the Aircraft Ground Service Guide and the Aircraft Towing Guide from Sandpiper Publications. The AGSG provides aircraft fuel requirements and capacity; performance specifications; ground-power locations and requirements; tire-pressure requirements; and weights and dimensions for pistons, turboprops and jets. The ASCG also has detailed drawings of service locations. The Aircraft Towing Guide contains reference material provided by aircraft manufacturers on recommended towing guidelines for a wide variety of aircraft. Each guide is priced at $19.95 for print or CD-ROM versions.