at senescence.info
You can search for any reference by title, author, date, editor, journal and publisher. Searching is case insensitive, and allows for only partial terms (e.g. seq with pickup both RNA-Seq and sequencing) matching. You can also use advanced queries that are detailed here.
Center for Disease Control and Prevention (2008) "Asthma and chronic obstructive pulmonary disease: US, 1997-2008 (Source: NHIS)" (http://www.cdc.gov/nchs/hdi.htm)