NNP

With the kind permission of Andrew W. Pollock III, Newman Portal has scanned and posted his volume United States Gold Coinage Die Varieties 1795-1834 (privately published, 1995). While the standard reference for die variety attributions is now the 2006 work Early U.S. Gold Coin Varieties, 1795-1834, by John Dannreuther and Harry W. Bass, Jr., specialists will find the Pollock work useful for the condition censes that are provided on a per variety basis. Pollock notes a “1,000+ catalogue survey,” not surprising given the extensive listings. 

Link to United States Gold Coinage Die Varieties 1795-1834 on Newman Portal: https://nnp.wustl.edu/library/book/626540