DATAMP (Directory of American Tool And Machinery Patents) An exceptional source for tool-related patent information.
OldToolHeaven.com Randy Roeder’s website with information on Millers Falls, Goodell-Pratt, and related manufacturers.
Stanley Logo Dating Page Bob Kaune’s excellent reference guide to Stanley blade logos
SydnasSloot Sandy Moss sells quality tools at good prices. He’s as knowledgeable and honest as they come. I bought my first handplane from Sandy about 20 years ago.
A Guide to the Makers of American Wooden Planes Fifth Edition ISBN-10: 1931626383 Tom Elliot. The definitive reference book on American wooden planes and planemakers.