Seattle, WA, April 16, 2009 - In its ongoing commitment to support travel professionals, Holland America Line has produced the information-packed brochure "Developing Group Business." The 36-page, four-color brochure provides comprehensive information on how to grow agency revenue by booking groups; how to identify, target and sell to those groups; and how to best utilize Holland America Line's group programs and promotion tools for maximum success. It is also available in a downloadable file for easy reference.