Chart of whale sightings compiled by MF Maury A.M. which shows the north west hemisphere from Alaska to Spain including the Pacific and Atlantic Oceans. Chart uses a multiple line graphs to show the number of whales spotted over the course of a year in various zones of the ocean.
by M.F. Maury, A.M. Lieut. U.S. Navy, Superin'dt. of the U.S.N. Observatory Washington ; compiled from materials in the Bureau of Ordnance and Hydrography, Commodore Charles Morris, Chief of Bureau, by P.M.A.C. Jackson, U.S.N.