Robert Vance's "Steel Traps - Obsolete and Antique" Books make up a fascinating 3 volume set that covers antique traps. Volume I is 103 pages. Volume II is 102 pages. Volume III is 82 pages.

Robert Vance's "Price Guide to Bear Traps" Book. 2005 - 2007 edition.

Robert Vance's "Antique Trap Price Guide" Book. 2017 Edition.