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Authors
- National Child Labor Committee (U.S.) author, issuing body.2
- Ashley, Raymond Harman, 1881-1947 author1
- Kammerer, Percy Gamble, author1
- Legnani, Mateo, author1
- Parmelee, Maurice, 1882-1969 author1
- PeĢrez, Ernestina, 1865-1951 author1
- Ritter, William Emerson, 1856-1944 author1
- Rolando, Carlos A., 1881-1974 author1
- Schweizer, F. (Fernando), 1880-1948 author1
- Woods, Arthur, 1870-1942 author1