TY - JOUR T1 - A Magnetic Survey of the Fortieth Parallel in North America between the Atlantic Ocean and the Great Salt Lake, Utah. JF - Proceedings of the Royal Society of London (1854-1905) VL - 29 SP - 1 EP - 2 PY - 1879/01/01/ UR - http://dx.doi.org/10.1098/rspl.1879.0001 M3 - doi:10.1098/rspl.1879.0001 AU - Thorpe, T. ER -