Published By US Fish and Wildlife Service, Department of the Interior
Issued almost 10 years ago
US
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Summary
Description
Direct comparison of the 1968 and 1975 survey figures is difficult because the 1975 survey covered four more habitat units, 81 more air miles and 64 more habitat Table 5. Tables 1 through 3 show actual sightings for each year. Table 5 shows some adjusted figures that suggest a population trend.