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Table 2 Type of literature content of aesthetic protection and tourism development at WNHSs

From: Aesthetic value protection and tourism development of the world natural heritage sites: a literature review and implications for the world heritage karst sites

Type of literature content

No. of articles

Percentage (%)

theoretical research

96

49.48%

technical and measures

33

17.01%

monitoring and evaluation

31

15.98%

model construction

15

7.74%

Others

19

9.79%