http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Historical estimates from the Drug Abuse Warning Network
1978-94 estimates of drug-related emergency department episodes
Substance Abuse and Mental Health Services Administration.
Also available via Internet from the SAMHSA web site (ENVOY 7, WP61, and LOTUS 5 files only).
Includes bibliographical references (page 35).