his early practice was platinotype prints, contacts, and this print is a contact print, which is 6.5 x 5.25 inches.
His works are in the VIctoria and Albert Museum, The Getty collection, there are many books which he has contributed photographs to including a National Geographic story in 1920., the McCLung Museum, and you can see an early platinum print here
https://photoseed.com/collection/single/in-the-gorge-at-tivoli/
doing a general google search will turn up many more items.
this print is nearly 100 years old and has no hint of discoloration or aging. shipped between foamcore boards, 4 ounces.