SÁM 66 (Stofnun Árna Magnússonar á Íslandi) is an 18th-century manuscript now at the Árni Magnússon Institute for Icelandic Studies, Iceland. Reference information and a copy of this manuscript can be found online.
SÁM 66, a manuscript from the 18th century, is held by the Árni Magnússon Institute for Icelandic Studies in Iceland.  You can find details about it and access a copy online.