PDF(995 KB)
PDF(995 KB)
PDF(995 KB)
美国国家公园志愿者服务及机制——以海峡群岛国家公园为例
({{custom_author.role_cn}}), {{javascript:window.custom_author_cn_index++;}}Volunteer service and mechanism in the U.S. national parks: A case study of Channel Islands National Park
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