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=== Railroad maps === | === Railroad maps === | ||
=== Topographic or geologic maps === | === Topographic or geologic maps === | ||
*'''Railroad maps''' indicate preferred routes of travel during an era where the routes changed from one year to the next. These also aid in tracking the possible whereabouts of railroad employees since many railroads merged or changed names. | *'''Railroad maps''' indicate preferred routes of travel during an era where the routes changed from one year to the next. These also aid in tracking the possible whereabouts of railroad employees since many railroads merged or changed names. | ||
*'''Topographic or geologic maps''' show terrain, natural resources (forests, mining resources), and features that affected travel (rivers, rapids, canals, mountains, mountain passes, canyons). | *'''Topographic or geologic maps''' show terrain, natural resources (forests, mining resources), and features that affected travel (rivers, rapids, canals, mountains, mountain passes, canyons). | ||