http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
National Ambulatory Medical Care Survey, United States, 1977
National Ambulatory Medical Care Survey (U.S.)
Office of Health Research, Statistics, and Technology.
National Center for Health Statistics (U.S.)
Title from title screen (viewed Nov. 13, 2012).
Advance data from vital and health statistics of the National Center for Health Statistics ; no. 49