The papers of painter Henry Mosler (1841-1920), who began his career in Cincinnati, Ohio, lived in Germany and Paris for at least 2 decades, and finally settled in New York, measure 4.8 linear feet and date from 1856-1929. The collection documents Mosler's life and career through biographical material, personal and professional letters from members of the military, museums, family, friends and colleagues, writings including an 1862 Civil War diary, personal business records, printed material, artwork and sketchbooks, and photographs of Mosler, his family, colleagues and artwork.

The collection of artists' letters compiled by Mary and John McGuigan Jr. measure 0.6 linear feet and date from 1794-1938. The collection is comprised of a group of letters, writings, and signed documents to and from a variety of artists, art administrators, art critics, historians, and art-related organizations assembled from multiple sources. It also includes associated printed material with some documents and a few photographs, including carte de visites and cabinet cards.

The research material of Connecticut artists and authors Nelson and Henry C. White, measures 4.5 linear feet and dates from circa 1851-1961. The bulk of the collection consists of Nelson C. White's correspondence, writings, and research, primarily related to J. Frank Currier and Abbott Handerson Thayer, and referencing Thomas Wilmer Dewing. Also found are the correspondence, writings, and research files of Nelson's father, Henry C. White, primarily relating to Dwight W. Tryon. Research files include artist correspondence, writings and notes, printed material, photographs of the artists, and photographs of artwork and exhibition installations.

The records of the Carnegie Institute, Museum of Art measure 265.8 linear feet and date from 1883-1962, with the bulk of the material dating from 1885-1940. The collection includes extensive correspondence between the museum's founding director, John Beatty, and his successor, Homer Saint-Gaudens, with artists, dealers, galleries, collectors, museum directors, representatives abroad, shipping and insurance agents, and museum trustees. The collection also includes Department of Fine Arts interoffice memoranda and reports; loan exhibition files; Carnegie International planning, jury, shipping, and sale records; Department of Fine Arts letterpress copy books, and a copy of the original card catalog index to these records.

Alexander Gardner (1821-1882) was a photographer best known for his portraits of President Abraham Lincoln, his American Civil War photographs, and his photographs of American Indian delegations. This collection contains 61 albumen prints that were shot by Gardner circa 1866-1868 and held in General William T. Sherman's personal collection. Photographs depict American Indian tribes and Peace Commissioners involved in the 1868 Fort Laramie Treaty; photographs shot along the Union Pacific Railway, Eastern Division in 1867; and photographs of American Indian delegations visiting Washington, D. C. from 1866-1868.

The Charles Henry Hart autograph collection dates from 1731-1917 and measures 1.7 linear feet comprised of 226 letters, portrait prints, and other documents signed by American artists.

The papers of painter and naturalist, Abbott Handerson Thayer, and the Thayer family date from 1851 to 1999, with the bulk of the material dating from 1881 to 1950, and measure 5.12 linear feet. Thayer's painting career, interest in concealing coloration (camouflage) in nature, and relationships with artists, patrons, family, and friends are documented through correspondence, writings, scattered legal and financial records, printed materials, and a scrapbook. Photographs are of Thayer, his family, studio, and friends, including artists. The collection also contains family papers created by his second wife, Emma Beach Thayer, his son Gerald, his daughters Mary and Gladys, and Gladys' husband David Reasoner, who managed Thayer's estate after his death.

The bulk of this collection was processed by Jane Livermore, a devoted and tireless volunteer in the Smithsonian Institution Archives between 1995 and 2004. Livermore is a former Science Service employee. She worked in the organization's library, oversaw the educational project "THINGS of Science," and served as Assistant to the Director. ...

This finding aid was digitized with funds generously provided by the Smithsonian Institution Women's Committee.

The records of Milch Gallery measure 42.5 linear feet and date from 1911-1995. Edward Milch (1865-1953) opened the Edward Milch Gallery in New York City. In 1916, he formed a partnership with his brother Albert Milch (1881-1951), a gilder and framer, creating E. & A. Milch, Inc., a gallery specializing in American art. Harold C. Milch (1904-1981), Albert's son, was appointed a partner in 1944 and continued the business until his death. Business records of Milch Gallery, 1911-1968, include correspondence, sales records, inventories, financial records, printed matter, photographs, and legal documents. Later additions to the records date from 1922-1995 and include correspondence; artists' files; financial, sales, and stock records; printed material; and photographs.