Sidney A. Beers – Improved Elastic Railroad – Scientific American – Series 1 – 27 Feb 1858 – Volume 013 – Issue 25, page 196, 27 February 1858

Sidney a. Beeers – improved elastic railroad – scientific american – series 1 – 27 feb 1858 – volume 013 – issue 25, page 196. Date: 27 February 1858.