“Grey House’s directory is aimed at marketers who require a list of group purchasing organizations (GPOs) that negotiate health care products purchased by hospitals and related facilities. Over 850 GPOs are listed, more than double the number from the prior edition, including networks, alliances, provider management companies, multihospital corporations, state and county purchasing departments, and other group buyers. Entries arranged alphabetically by GPO name, supply detailed profiles including contact information, products negotiated, vendor requirements, and key personnel. Most entries also include a list of the GPO’s member institutions (e.g., hospitals, nursing homes, clinics), organized by state. The directory concludes with five indexes: ‘Expanded Services,’ ‘Geographic,’ ‘Key Personnel,’ ‘Member Institutions,’ and ‘Organization Type.’ ”