One of the directories I mentioned in a previous SearchDay article was the Resource Discovery Network (RDN).
ຫນຶ່ງໃນບັນດາລາຍການທີ່ຂ້າພະເຈົ້າໄດ້ກ່າວມາໃນບົດຄວາມ SearchDay ກ່ອນຫນ້ານີ້ແມ່ນ Resource Discovery Semalt (RDN).