RASIO GAYA APUNG DAN GAYA TENGGELAM PURSE SEINE TIPE LENGKUNG PADA KAPAL UKURAN DIBAWAH 20 GT DI PPP BULU, TUBAN (Ratio of Buoyancy and Sinking Force of Purse Seine with Curved Type on Vessels Under 20 GT in PPP Bulu, Tuban) Download