Roberts, O. W., Irving, E., & Joly, J. R. (1827). Narrative of voyages and excursions on the east coast and in the interior of Central America: Describing a journey up the river San Juan, and passage across the lake of Nicaragua to the city of Leon; pointing out the advantages of a direct commercial intercourse with the natives. Printed for Constable & Co..

Roberts, Orlando W., et al. Narrative of Voyages and Excursions on the East Coast and in the Interior of Central America: Describing a Journey Up the River San Juan, and Passage Across the Lake of Nicaragua to the City of Leon; Pointing Out the Advantages of a Direct Commercial Intercourse with the Natives. Printed for Constable & Co., 1827.