1 map. Scale not given (W 87°50ʹ--W 87°36ʹ/N 15°48ʹ--N 13°23ʹ). Shows line of railway and mule roads. Relief shown by hachures and one spot height. Depths shown by soundings. Oriented with north to the right. Original version is a map from: Preliminary notes to a report on the proposed Honduras Interoceanic Railway / Ephraim George Squier.