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501. Transportation maps. Maryland, transportation map; highways corrected to July 1, 1947. Scale 1:250,000, approximately 1 in. = 4 m. Revised edition, 1947. n. p.

Corporate/Agency Authors:: Public Roads Bureau and Commerce Dept.
Publisher:: Public Roads Bureau
Date:: Geological Survey [1950]
SuDoc number:: C 37.11:M 86/950/sh.1-3

502. Transportation maps. West Virginia, transportation map; highways corrected to Apr. 1, 1946. Scale 1:250,000, approximately 1 in. = 4 m. n. p.

Corporate/Agency Authors:: Public Roads Bureau and Commerce Dept.
Publisher:: Public Roads Bureau
Date:: Geological Survey [1950]
SuDoc number:: C 37.11:W 52v/950/sh.1-5

503. Traffic speed trends.

Corporate/Agency Authors:: Public Roads Bureau and General Services Administration
Publisher:: Public Roads Bureau
Date:: Aug. 1, 1949
SuDoc number:: GS 3.2:Sp 3

504. 1949-50 inventory and guide for action, the President's Highway Safety Conference.

Corporate/Agency Authors:: Public Roads Bureau and Commerce Dept.
Publisher:: Public Roads Bureau
Date:: [1949.]
SuDoc number:: C 37.7:In 8/949-50

505. Financing of highways by counties and local rural governments, 1931-41; by Division of Financial and Administrative Research.

Corporate/Agency Authors:: Public Roads Bureau and Commerce Dept.
Publisher:: Public Roads Bureau
Date:: 1949
SuDoc number:: C 37.2:F 49

506. Public roads, Journal of highway research, Aug.-Dec. 1949; v. 25, no. 9-11.

Corporate/Agency Authors:: Public Roads Bureau and Commerce Dept.
Publisher:: Public Roads Bureau
Date:: [1949.]
SuDoc number:: C 37.8:25/(nos.)

507. Traffic volume trends, May-Sept. 1949.

Corporate/Agency Authors:: Public Roads Bureau and Commerce Dept.
Publisher:: Public Roads Bureau
Date:: [1949.]
SuDoc number:: C 37.9:949/(nos.)

508. Transportation map. Iowa, transportation map: highways corrected to Feb. 1, 1949, originally compiled by Geological Survey, subsequent revisions by Public Roads Bureau, Scale 1:250,000, approximately 1 in.=4 m. Revised edition, 1949. n. p.

Corporate/Agency Authors:: Public Roads Bureau and Commerce Dept.
Publisher:: Public Roads Bureau
Date:: 1949 [published 1952]
SuDoc number:: C 37.11:Io 9/949/sh.1-8

509. Transportation maps. Mississippi, transportation map; highways corrected to Jan. 1, 1949 compiled by Geological Survey. Scale 1: 250.000, approximately 1 in. = 4 m. n p.

Corporate/Agency Authors:: Public Roads Bureau and Commerce Dept.
Publisher:: Public Roads Bureau
Date:: 1949 [published 1951]
SuDoc number:: C 37.11:M 69i/949/sh.1-8

510. Maine, transportation map, highways, railroads, canals, air lanes, and dredged channels; highways corrected to Feb. 1, 1939. Scale 1:250,000 approximately 1 in.=4 m. Revised edition, 1940.

Corporate/Agency Authors:: Public Roads Bureau and Agriculture Department
Publisher:: Public Roads Bureau
Date:: 1940
SuDoc number:: A 22.9/2:M 28/sh.1-6/940

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