Search History Select to load keywords (author equals "ยุทธนา แก้วตาบุตร") AND (author equals "อภิรัฐ ธีรภาพวิเศษพงษ์") AND (subject equals "วัสดุรูพรุน") AND (author equals "ศรีไฉล ขุนทน") AND (subject equals "Factory and trade waste -- Recycling (Waste, etc.)")
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