STATI UNITI (A. T., 127-146)
Roberto ALMAGIA
Fabrizio CORTESI
Mario SALFI
Piero LANDINI
Emilio MALESANI
Pino FORTINI
Emilio MALESANI
Alberto BALDINI
Carlo DE ANGELIS
Anna Maria RATTI
Gennaro [...] Harris, The sugar-beet in America, ivi 1919; J. O. Morgan, Field crops for the cotton belt, ivi 1920; H. B. Brown, Cotton: 1923; U. S. Department of Agriculture, Forest Service, Statistical american forests and forests products, Washington 1927; E. ...
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