http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Life earnings in selected occupations in the United States
by Harold F. Clark...with the assistance of Mervyn Crobaugh...Wilbur I. Gooch...Byrne J. Horton...[and] Rosemary Norris Kutak...
"A few selected references": p.403-405; "Studies in progress": p.[406]