Description and technical documentation of the PICADAD file.

March 1978.

Census of agriculture, 1987 : final county file : technical documentation.

"AG-87-2."

Navy fact file.

Mode of access: Internet.

Geographic base file system--uses, maintenance, problem solving : conference proceedings, November 16-17, 1971, Arlington, Tex.

Issued May 1972; revised November 1976.