This section lists companies providing specific services to the international hydroelectric market. Under each category, service providers are listed alphabetically. To contact specific companies, refer back to the Company Listings. The “RS#” reference that appears after some listings provides a quick and easy way to obtain information from companies that have advertised in this issue. Simply tear out the reader service card between pages 56 and 57, circle appropriate companies’ numbers, and mail or fax the card to HCI Publications.