PENGARUH PERBANDINGAN JUMLAH DAGING IKAN PORA-PORA DAN TEPUNG TAPIOKA TERHADAP MUTU KERUPUK IKAN PORA-PORA SELAMA PENYIMPANAN (The Effect of Ratio of Pora-pora Fish and Tapioca Flour on The Quality of Pora-pora Fish Crackers During The Length of Storage - Feraldo, Adhitya; Program Studi Ilmu dan Teknologi Pangan Fakultas Pertanian USU (Universitas Sumatera Utara, 2017)