Breaking down Table IDs: https://www.census.gov/programs-surveys/acs/guidance/which-data-tool/table-ids-explained.html
Access tables by subject: https://www.census.gov/programs-surveys/acs/guidance/subjects.html
Summary File Documentation: https://www2.census.gov/programs-surveys/acs/summary_file/2015/documentation/tech_docs/2015_SummaryFile_Tech_Doc.pdf