The Library of Congress now offers a free professional development resource for educators: Teaching with Primary Sources Direct. .  The Library of Congress has designed this new resource to facilitate the process of integrating primary sources into classroom teaching. It offers educators the opportunity to customize professional development activities for use at the school, district or regional level. This online resource includes professional development modules and classroom lessons and primary sources from the Library of Congress arranged thematically. It is designed to teach both content knowledge and critical thinking skills.