The National Center for Health Statistics (NCHS) released public-use data files for the 1997 National Hospital Ambulatory Medical Care Survey (NHAMCS). The NHAMCS "collect[s] data on the utilization and provision of ambulatory care services in hospital emergency and outpatient departments." The Website for the survey describes methodology and data, provides technical documentation for accessing and manipulating the data, and links users to related reports. The data and documentation for the survey may be downloaded from the Website or from the NCHS FTP server.