Sample Slab Update Newsletter
David Schrager publishes the Sample Slab Update Newsletter and has contributed the back issues to the Newman Portal. The popularity of third party grading has created a market for the slabs themselves, and a number of authors have worked on cataloging the various slab types and understanding the rarity of individual issues. The occasional oddity is also noted - the inaugural issue of Schrager's newsletter records a PCGS slab containing a chocolate Franklin half dollar.