Subterranean wonders :
Mammoth Cave and Colossal Cavern, Kentucky.

APA Citation

Louisville and Nashville Railroad Company. Passenger Department. (190). Subterranean wonders: Mammoth Cave and Colossal Cavern, Kentucky. 21st ed., new ser. Louisville, Ky.: Louisville & Nashville Railroad, Passenger Dept..

MLA Citation

Louisville and Nashville Railroad Company. Passenger Department. Subterranean Wonders: Mammoth Cave And Colossal Cavern, Kentucky. 21st ed., new ser. Louisville, Ky.: Louisville & Nashville Railroad, Passenger Dept., 190.

Warning: These citations may not always be complete (especially for serials).