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Microfilm aperture card system

Subject Source: Library of Congress Subject Headings

Found in 2 Collections and/or Records:

Permit plans

Identifier: 5410.004
Scope and Contents Plans filed with building permits in paper form from circa 1902-1970 and on aperture cards from circa 1970-1995. Contact the Inspectional Services Department, Building Division for access to plans on aperture cards.
Dates: circa 1902-1995

Street layout plans (L-Plans)

Identifier: 5060.009
Scope and Contents Master microfilm on aperture cards of L-Plans which document street layouts. Plans have been scanned and are available online.
Dates: circa 1870-1985