SPIRO is the visual online public access catalog to the 35mm slide collection of the Architecture Visual Resources Library (AVRL) at the University of California at Berkeley. The collection numbers over 250,000 slides and 20,000 photographs
ARC currently contains descriptions of 50% of the National Archives traditional holdings. Many of the records are described broadly at the record group and series levels. For some series, ARC includes specific descriptions at the file unit and item levels