ร่วมแลกเปลี่ยนเรียนรู้เชิงบูรณาการ และศึกษาเส้นทางธรรมชาติ ณ ศูนย์ศึกษาการพัฒนาเขาหินซ้อนอันเนื่องมาจากพระราชดำริ

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