MLA

Through Northern Nebraska to the Black Hills : Elkhorn Valley Line : Free Homes for the 1,000,000 ... Rand, McNally & Co., printers and engravers, 0AD. https://collections.library.yale.edu/catalog/16394249.

APA, 6th edition

Through northern Nebraska to the Black Hills : Elkhorn Valley Line : free homes for the 1,000,000 ... (0 C.E.). [Maps.]. Rand, McNally & Co., printers and engravers, https://collections.library.yale.edu/catalog/16394249.