Professional Resources and Articles
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"Questions that Compel and Support" - article by S.G. Grant, Kathy Swan and John Lee - from Teaching the C3 Framework. The article gives a lot of good background on Compelling and Supporting Questions along with examples and criteria.
"Engaging Students with Primary Sources" - Smithsonian article - includes information about making use of things like photographs and oral histories as well as examining limitations and strengths of different types of sources.