O'Brien Building Photo Collection
A collection of photographs and photographs of architectural drawings pertaining to the construction of the O’Brien Building.
The Oaks at Menorah Park Oral History Collection
This collection contains four recorded interviews with residents of The Oaks at Menorah Park, a senior living facility in DeWitt, New York.
Oceanside Community

20th century images relating to the people and places in the Oceanside community.

Oceanside High School Yearbooks

Yearbooks of the graduating classes of the Oceanside High School.

Oceanside Library History
20th century images relating to the history of the Oceanside Library.
Oceanside's Bicentennial Celebration
Images of Oceanside's Bicentennial Celebration.
Octagon Houses Collection
Contains selected images of photographs in the Octagon Houses Collection. The New York State octagon house files were gathered for use in "Octagon Buildings in New York State," compiled by Ruby M. Rounds of the New York State Historical Association.
Ogdensburg City School District Yearbook Collection
This collection consists of issues of the Devilog dating between 1946 and 2016.
Old Houses of the North Country
This collection contains newspaper clippings of Watertown (NY) Daily Times articles written by David F. Lane of old houses in the North Country.
Old Main SUNY Oneonta
Old Main was the first major building on the SUNY Oneonta campus. After significant deterioration, Old Main was razed in 1977, but the Old Main pillars were saved from the wrecking ball and moved to campus shortly thereafter.
Olin Dows Collection

Photographs depicting the work of Hudson Valley artist Olin Dows.

Oneida County Anti-Slavery Petitions
Petitions signed by the residents of Oneida County calling for an end to slavery in the mid-19th century.
Oneida Yearbook Collection
Yearbooks from Oneida City High School, from 1936 - 2018. Several "Senior Annual" publications are also included.
Oneonta City Directories
Directory of Oneonta for 1901-1902: a classified business directory and householder's street directory together with a compendium of the village government, institutions, incorporated companies, societies, miscellaneous organizations, etc.
Oneonta NY Railroad Memorabilia at Hartwick College
These materials were used by Dr. Eugene Milener during the compilation of his book, Oneonta: The Development of a Railroad Town, which he subsequently donated to the college archives.
Onondaga Community College Historic Photographs
The collection features photographs chronicling the history of Onondaga Community College from the 1960s to the 2010s.
Onondaga Community College Yearbooks
Onondaga Community College Yearbooks date between 1964 and 1975, documenting student life at the college. The yearbook is titled The Chieftain.
Onondaga Parks Association
A collection of postcards portraying Onondaga Park in the early 20th century.
Ontarian Yearbooks
A collection of SUNY Oswego yearbooks, The Ontarian, from 1922 through 2005.
Oral Histories
A collection of interview transcripts from NCCC Former faculty members.
Oral Histories - Hudson River Commercial Fishermen

Interviews with commercial fishermen covering the time period between the 1920s and the 1990s.

Oral Histories of Tompkins County
This collection contains Oral Histories from people living and working in Tompkins County, New York.
Orange County Atlas Collection

This collection includes the F.W. Beers County Atlas of Orange County (1875) and the A.H. Muller Atlas of Orange County (1903).

Orange County Community College History Collection

Historical photographs of the college, including several aerial shots of the campus.