http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Symposium on Rock Mechanics 1972 : Pennsylvania State University)
U.S. National Committee for Rock Mechanics
Edited by H. Reginald Hardy, Jr. and Robert Stefanko.
"Sponsored by the U.S. National Committee for Rock Mechanics of the National Academy of Sciences--National Academy of Engineering and the Pennsylvania State University."