Sonnestern, Maximilian von. Mapa general de la Republica de Guatemala. Published by J. Rau, New York, New York. 1859. Accessed June 19 2023. https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~240027~5512131:Mapa-general-de-la-Republica-de-Gua?sort=Pub_List_No_InitialSort%2CPub_Date%2CPub_List_No%2CSeries_No&qvq=q:Guatemala;sort:Pub_List_No_InitialSort%2CPub_Date%2CPub_List_No%2CSeries_No;lc:RUMSEY~8~1&mi=9&trs=179#