Iver O. Penttinen was a collector and aficionado of World War I aviation materials. The collection contains reports, correspondence, images, and memorabilia of both the Central Powers and the Entente Powers.

Walther Aschoff was a pilot in World War I flying Gotha bombers. He was involved in the bombing of London in 1917. The materials reflect his career as a pilot both in World War I and World War II where his trace disappears.

Al Zakrzewski was a World War I aficionado mainly collecting the famous Sanke Cards published by Willi Sanke. Next to his extensive postcard collection, he also was interested in rare aviation medals, ribbons, and decorations. ...