The bulk of the collection consists of postcards - in both color and black and white - depicting scenery, landmarks and agricultural practices throughout the Pacific Northwest and Canada. The collection also includes postcards and prints documenting scenes and activities from around Corvallis and the OAC campus. Many of the postcards are annotated and some were used to send messages - both by and to Gilbert - delivered through the post.
Of particular note are several images, many of them humorous, focusing on the membership, lodging and functions of the college's Oxford Club, predecessor to the Sigma Phi Epsilon fraternity. Gilbert was a member of the Oxford Club and appears to have taken many of the photographs organized into this component of the collection.