Analysis of information sources in references of the Wikipedia article "Underground Railroad" in English language version.
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ignored (help)Between 1840 and 1860, more than 30,000 people enslaved in America came secretly to Canada and freedom
'A network of houses and other places abolitionists used to help enslaved Africans escape to freedom in the northern states or in Canada ... ' —American Heritage Dictionary
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: CS1 maint: multiple names: authors list (link)'A network of houses and other places abolitionists used to help enslaved Africans escape to freedom in the northern states or in Canada ... ' —American Heritage Dictionary
Between 1840 and 1860, more than 30,000 people enslaved in America came secretly to Canada and freedom
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: CS1 maint: multiple names: authors list (link)