?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aulast=Haris&rft.au=Haris%2C+Jefri+Anto&rft.aufirst=Jefri+Anto&rft.inst=Universitas+Negeri+padang&rft.date=February+2017&rft.degree=Bachelor%2FSkripsi&rft.title=Desain+Terowongan+Development+di+Wilayah+Ombilin+I+Sawahluwung+PT.+Bukit+Asam+(Persero)+Tbk%2C+Unit+Pertambangan+Ombilin+Sawahlunto