https://artinstamps.blogspot.com/2018/03/roy-gjertson.html
Stamp Art: Roy Gjertson
[USA] (b 1926) "A native Minnesotan, Roy Gjertson served in the U.S. Army Air Corps during World War II as a radio operator and gun...
stamp artroy
https://profiles.ucla.edu/david.gjertson
David Gjertson | UCLA Profiles
David Gjertson's profile, publications, research topics, and co-authors
daviduclaprofiles