Distance map United States, Mexico and Canada
Includes distances for railroads, airways and ocean travel. Available also through the Library of Congress Web site as a raster image.
railroads↗
subject
airways
airways: explore 1 source-linked works published from 1919 to 1919, with original documents and citations.
This collection is a preview while coverage and quality are evaluated.
Coverage and selection
Includes records with this source-supplied label or an explicit phrase match in their metadata. Matches indicate a mention, not proof that a paper uses a method or tests a material. Source versions are consolidated by DOI.
Sources: loc. Collection updated 2026-09-18. Counts describe this index, not the complete source archives.