Format Identification Guide

California Audiovisual Presentation Project.

The Collection ID Guide of the University of Illinois at Urbana Champaign's Preservation Self-Assessment Program.

The Museum of Obsolete Media.

Indiana University's FACET (Field Audio Collection Evaluation Tool) Guide. 

The Association for Recorded Sound Collections (ARSC) Guide to Audio Preservation.

National Archives’ "Audio Guidance: Identifying Audio Formats" page.

Wikipedia's Timeline of Audio Formats.

Little Film. Has visual aids and dates for small-gauge film (8-16mm).

The Film Preservation Guide's Edge code chart. Film can be dated by looking for the edge codes at the edge of the film, given that they correspond to the film's date of manufacture.

National Archives’ "Motion Picture Film Guidance" page.

The Image Permanence Institute's Filmcare.org.

Texas Commission for the Arts Video Identification and Assessment Guide. Includes videotape formats introduced between 1956 and 1999.

Video Preservation Website, Video Format Identification Guide. Includes videotape formats introduced between 1956 and 1995. Less complete, but is a handier, web-based document.

National Archives Video Format Identification Guide.