"Our Valley Then & Now," featuring two historical perspectives of the San Fernando Valley, will take place at 7 p.m. in the Presentation Room of the Oviatt Library, located in the center of the campus at 18111 Nordhoff St. in Northridge.

Archivist Elizabeth Altman, in her talk "Homes and Ranches of the Rich and Famous," will provide a visual tour of the homes and ranches of the famous folk who made the Valley their home.

Archivist Kirby Pringle will talk about the development of the Valley's industries, including agriculture, aviation and aerospace in his lecture, "From Wheat to Rockets: The Valley's Ever Changing Economy."

The San Fernando Valley History Digital Library, with the digital address of digital-library.csun.edu, was launched in 2001and focuses on the socio-political history of Los Angeles' San Fernando Valley.

By using the digital library, people can access a data base that brings together, for the first time, significant historical photographs, illustrations, maps, manuscripts, documents and related graphic materials from a variety of collections on the Northridge campus as well as the collections of a variety of local historical societies.

For more information about the lecture, call (818) 677-2638.

Northridge's Oviatt Library is home to more than one million volumes, three million microfilms, 125,000 government publications, 7,798 periodical titles and an extensive history collection of mixed media, rare books and archives. It serves as the main research facility for the San Fernando Valley.