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… operations (Lagler 1939; Davidson 1968; Anderson 1986; NCC 1989), in agricultural fields (Nomsen 1989), and at airports (DeFusco and Nagy 1983; BSCE 1988). In … Mattingly 1976; Miller and Davis 1990a,b; Mott 1980; NCC 1989; Nelson 1970; Nelson 1990a; Nomsen 1989; Noriss and …
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