The Library of Congress has good guides for analyzing primary sources including political cartoons, maps, documents, newspapers, oral histories, photos, and other resources useful for students in all content areas.
Making it easy to implement: handy guides and questions for classroom dialogue and student reflection. The simple guides outline steps for students to read or review and gather details, hypothesize and reflect about the source, and ask questions to lead to more observations and reflections.
The guides offer steps based on student reading comprehension level. What's more, teachers can use the tools for all reading content, LOC resources, and other historical, global, and current topics.