?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=https%3A%2F%2Frepository.itny.ac.id%2Fid%2Feprint%2F4081%2F&rft.title=Bukti+review+korespondensi%3APenentuan+peringkat+batubara+berdasarakan+analisa+maseral+di+daerah+tanjung+belit%2C+kabupaten+dharmasraya%2C+provinsi+sumatera+barat&rft.creator=Helmi%2C+Hurien&rft.subject=ZA4450+Databases&rft.publisher=ITNY&rft.type=Other&rft.type=NonPeerReviewed&rft.format=text&rft.language=en&rft.identifier=https%3A%2F%2Frepository.itny.ac.id%2Fid%2Feprint%2F4081%2F1%2F2.%2520Kurvatek%2520Kalori%2520Batubara..pdf&rft.identifier=++Helmi%2C+Hurien+++Bukti+review+korespondensi%3APenentuan+peringkat+batubara+berdasarakan+analisa+maseral+di+daerah+tanjung+belit%2C+kabupaten+dharmasraya%2C+provinsi+sumatera+barat.++ITNY.++++(Unpublished)++