http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
List of periodicals abstracted by Chemical abstracts, with key to library files and other information
Chemical abstracts list of periodicals with key to library files
"The library canvass was conducted ... by the Research Information Service of the National Research Council," 19 -1938.