The Oakland Museum of California has put together a digital archive of photographs captured by Dorothea Lange, showcasing some of the best works from the 20th-century documentary photographer and photojournalist.

The extensive archive is split into four categories: The Depression, World War II at Home, Post-War Projects and Early Work/Personal Work. Each of the categories provide a synopsis of Lange’s work during the specified timeframes and further divides her images into themed galleries, which show not only the images Lange captured, but also supplementary material, such as notes to Lange from the United States Department of Agriculture, contact sheets of Lange’s images, maps of her travel routes and more.

It’s a fascinating, insightful and sometimes heartbreaking journey through the life and work of one of the most iconic 20th century American photographers. The online exhibition is entirely free to view, so set aside a few hours and head on over to the Oakland Museum of California website.