The Big History Project (skills taught: contextualization, sourcing, causation, comparison, continuity & change over time, close reading)
Digital Inquiry Group (formerly Stanford History Education Group or SHEG). This organization offers free lesson plans and assessment ideas that emphasize historical thinking skills, perfect for logic stage students. The “Lunchroom I” and “Lunchroom II” lesson plans are a fun introduction to historical thinking skills.
Annotated Reading list for Logic Stage: Age-Appropriate Books about the Holocaust via School Library Journal (you know your student, some of these may be too heavy for younger logic stage students).