I did a search, and I don't think this has been posted before,. If I'm wrong, please delete.
Here's a link to a PDF of "American Engraved Powder Horns: A Study Based on the J. H. Grenville Gilbert Collection" published in 1945.
It's a survey of a horn collection including pictures, drawings of engravings, history of owners, etc. 150 pages, but well worth printing out. Hard cover copies, if you can find one, are well over $200.
https://www.metmuseum.org/art/metpublications/American_Engraved_Powder_Horns
Here's a link to a PDF of "American Engraved Powder Horns: A Study Based on the J. H. Grenville Gilbert Collection" published in 1945.
It's a survey of a horn collection including pictures, drawings of engravings, history of owners, etc. 150 pages, but well worth printing out. Hard cover copies, if you can find one, are well over $200.
https://www.metmuseum.org/art/metpublications/American_Engraved_Powder_Horns