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International comparisons and standardization
Leonard, William R., (1953)
Le informazioni statistiche sulle aziende agricole in Italia sino al censimento del 1982
Angeli, Liano, (1982)
Special issue in honor of Nancy and Richard Ruggles
Tice, Helen Stone, (2004)
In memoriam: Richard Ruggles (1916 - 2001)
Wolff, Edward N., (2001)
Concepts of Real Capital Stocks and Services
Ruggles, Richard,