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- 69 - Figure 6 VISITOR COUNTS NATIONAL MUSEUM OF NATURAL HISTORY [[image - line graph showing number of visitors (in millions); between 1988 and 1991, visitations dropped 13.6%]] NATIONAL MUSEUM OF AMERICAN HISTORY [[image - line graph showing number of visitors (in millions); between 1988 and 1991, visitations dropped 13.4%]] NATIONAL AIR & SPACE MUSEUM [[image - line graph showing number of visitors through August 1991 (in millions); between 1988 and 1991, visitations dropped 19.2%]]