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Dan Rios papers

Identifier: SC003

Content Description

Approximately 222.31 linear ft. (195 boxes with around 43,000 envelopes) of photograph negatives, photographic prints, and correspondence created by Daniel Flores Rios, Chief Photographer, Escondido Times-Advocate and North County Times from 1968-2001. The earlier years of the collection contain images by other Times-Advocate photographers as well. The papers provide a visual documentation of the San Diego geographic region with a strong emphasis on North County and its community, places, and events that helped shape its history. The negatives are in varying formats, predominately 35mm and 120mm, in both color and black and white, positive and negative film. Acetate film was used from 1925 to the present, and polyester film from 1960 to the present and both may be included. Generally speaking, film appears to be safety film.

In addition to the estimated 1,000,000 negatives in the collection, Dan's papers also contain smaller numbers of 8x10 and large format photographic prints and slide film. There is also a substantial amount of correspondence in the collection, and many of the envelopes that house the negatives contain important context about both the photography and the newsroom process at the Times-Advocate.


  • 1968-2001


Conditions Governing Access

The Dan Rios papers have not been processed but are open for research. Please contact Special Collections in advance to request access.

The Special Collections and University Archives Reading Room is accessible by appointment only, Monday-Friday, 8am - 4pm. Final requests for materials must be made one hour prior to closing. Please submit requests for archival materials at least 24 hours in advance of desired appointment. Materials requested over the weekend will be available on the following Tuesday at the earliest. Please note that Special Collections and University Archives observes all campus holiday closures as noted in the Library Calendar. For more information, please send an email to

Conditions Governing Use

Property rights to the physical object belong to CSUSM University Library. Intellectual rights, including copyright for Dan Rios's photography belong to CSUSM University Library. Other rights may reside with the creators of the records and their heris. For permission to reproduce or to publish, please contact

Permission to examine Library materials is not authorization to publish or to reproduce the examined material in whole, or in part. Persons wishing to quote, publish, perform, reproduce, or otherwise make use of an item in the Library’s collections must assume all responsibility for identifying and satisfying any claimants of the copyright holder.

The researcher assumes full responsibility for use of the material and agrees to hold harmless the University Library, and California State University, against all claims, demands, costs, and expenses incurred by copyright infringement or any other legal or regulatory cause of action arising from the use of the Library's materials.

In assuming full responsibility for use of the material, the researcher also understands that the materials they examine may contain Social Security numbers, other personal identifiers, and/or sensitive material on potentially living and identifiable individuals (e.g., medical, evaluative, or personally invasive information). The researcher agrees not to record, reproduce, or disclose any Social Security number or other information of a highly personal nature that may be found.


222.31 Linear Feet (186 containers totaling 195 boxes and drawers of various sizes, roughly sized like postcard boxes. Metal containers house 2 or 3 drawers each.)




The collection, created by Daniel Flores Rios, Chief Photographer, Escondido Times-Advocate and North County Times from 1968-2001, provides a visual documentation of the San Diego North County geographic region, community, and events that helped shape its history.

Immediate Source of Acquisition

The collection was donated by Dan Rios to Special Collections, California State University San Marcos Library, on April 17, 2018.

Related Materials

The Escondido Historical Newspapers, available to those with campus IDs and those with campus access only, contain photographs by Dan Rios, as well as accompanying information such as captions, issue dates, and related articles. The newspapers can be found at

Condition Description

The collection was stored in the donor’s garage for over 30 years with no environmental control. The negatives are stored in envelopes and sleeves (not archival quality) within metal drawer units and boxes of varying sizes. Some of the boxes show evidence of exterior silverfish grazing and rodent damage. Items show signs of soil and surface dirt, water stains, acidic and light damage, and pest droppings. As of January 2019, staff is conducting an item level inventory of the collection, following which it will be rehoused in archival standard housing.

Guide to the Dan Rios papers.
In Progress
Sean Visintainer
2019-08-05 cc
Language of description
Script of description

Repository Details

Part of the CSUSM Special Collections Repository

California State University San Marcos Library
333 S. Twin Oaks Valley Rd
San Marcos California 92096-0001 United States