https://www.lexpera.com.tr/resmi-gazete/25-11-1991/21062 monthly 2026-07-21T06:04:16Z https://www.lexpera.com.tr/resmi-gazete/metin/bogazici-universitesi-kandilli-rasathanesi-depremlerin-onceden-belirlenmesi-uygulama-ve-arastirma-2 1991-11-25T00:00:00Z