Hvem var Frederick Catherwood? 


Bourbon, Fabio (1999): The Lost Cities of the Mayas: The Life, Art, and Discoveries of Frederick Catherwood
Boulhosa, Patricia Press. “The Law of Óláfr inn Helgi.” In Icelanders and the Kings of Norway: Mediaeval Sagas and Legal Texts. Leiden, Netherlands: Brill, 2005.