Photographic material in the collection includes contact sheets, color slides, and photographic prints.

Morath's documentary photographs depict people and events in a wide range of countries, including Austria, China, England, France, Germany, India, Italy, Romania, Russia, Spain, and Tunisia, as well as throughout Mexico and the United States.

The collection includes portrait studies of public figures, including Yul Brynner, Alexander Calder, Alberto Giacometti, Dustin Hoffman, Henry Moore, Anaïs Nin, Pablo Picasso, Andrei Voznesensky, and Yevgeny Yevtushenko. It also includes projects with her longtime collaborator, artist Saul Steinberg.

Papers in the collection include story lists, captions, notebooks, general files, and publicity related chiefly to her photography. The collection also includes audiovisual material, electronic files, and artifacts.

A group of printed material accompanies the collection and consists of an incomplete set of her monographs, as well as works related to travel, languages, and other subjects.

The collection also chronicles Morath's personal life, including her marriage and family with playwright Arthur Miller, and provides ancillary documentation of his work.

In this guide to the collection, library staff chiefly retained Morath's titles and spellings, while contact sheets include authorized forms of names derived from her story lists.

Chronological arrangements within the collection reflect the image creation date, not the date the photograph was printed. Notes throughout the collection include Morath's "story numbers," when easily discerned by library staff.