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New Approaches to Ecological Surveys NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM NCHRP SYNTHESIS 400 N CH R P SYN TH ESIS 400 New Approaches to Ecological Surveys TRANSPORTATION RESEARCH BOARD 500 F ifth S treet, N .W . W ashing to n, D .C . 20001 A D D R ESS SER VICE R EQ UESTED TRB A Synthesis of Highway Practice