The meaning of UNDERGROUND RAILROAD is a system of cooperation among active antislavery people in the U.S. before 1863 by which people escaping enslavement were secretly helped to reach the North or Canada.
Freedom Quilts: Mathematics on the Underground Railroad. The article focuses on the significance of freedom quilts in the mathematics lesson. Quilting requires quilt makers to apply an extensive amount of mathema... Neumann,Maureen - 《Teaching Children Mathematics》 被引量: 1发表: 2005年 Azalea ...