There are some opening ads by Exxon-Mobil, but these are short. Lesson plans are here too.
These are free downloads. In the introduction to the collection, Michael Gonchar writes (March 25, 2017):
Your NCSS journals are published and posted online: Social Education and/or Social Studies and the Young Learner. A few articles are "open access," free PDFs at www.socialstudies.org/publications/archives. The online magazine Middle Level Learning awaits there now—for NCSS members only. Here’s a peek at what’s new in these publications: