Form 990

IRS Makes Electronically Filed Form 990 Data Available in New Format
 * https://www.irs.gov/uac/newsroom/irs-makes-electronically-filed-form-990-data-available-in-new-format
 * https://aws.amazon.com/public-data-sets/irs-990/
 * https://www.irs.gov/charities-non-profits/search-for-forms-990-n-filed-by-small-tax-exempt-organizations
 * https://www.irs.gov/charities-non-profits/copies-of-scanned-eo-returns-available

National PTA
Under the Financial Documents header on this page:
 * http://www.pta.org/about/content.cfm?ItemNumber=1508&navItemNumber=554
 * 2015: http://s3.amazonaws.com/rdcms-pta/files/production/public/2014-NPTA-Form990.PDF
 * 2014: http://s3.amazonaws.com/rdcms-pta/files/production/public/NPTA-2014-Public_Disclosure.pdf
 * 2013: http://s3.amazonaws.com/rdcms-pta/files/production/public/NPTA%202013%20Public%20Disclosure.pdf