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1
1970 census of housing.
Published: U.S. Dept. of Commerce, Bureau of the Census : For sale by Supt. of Docs., U.S. G.P.O., 1972“…Philadelphia Metropolitan Area (Pa.) Census, 1970.…”
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2
Components of inventory change : Philadelphia, Pa.-N.J. standard metropolitan statistical area.
“…Philadelphia Metropolitan Area (Pa.) Census, 19th, 1970.…”
Government Document Book