File:Jack Frost--Connecting Links As Seen From Customs House Tower.jpg
Book copyright 1955; copyright not renewed according to search of Copyright Office database. Author died in 2012. Note on last page of book states: "Therefore we are grateful to Mr. Frost for granting reproduction rights, without charge, to newspapers, magazines, radio, television and other media, provided that permission is secured in writing. The interests of Boston would be well served by having the widest possible use made of these sketches."