The Philatelic Foundation, over the past 30 years, has released a series of “Opinions” publications that brings into focus some of the items which are sent into the Philatelic Foundation for expertizing. Items of significant philatelic and financial value are submitted regularly for the Expert Committee’s review. These publications highlight some of the more interesting stories behind these items. Moreover, the authors are some of the most recognized individuals in philately. Each are scanned as a PDF file and are fully text-searchable. Click here to download and read the books.