Wikipedia:WikiProject U.S. Roads/Washington/Resources
Maps, 1893-1935
More history
Images from the biennial reports
Early USGS topo maps
and
other early maps
1932 summary of early road history
History of Roads and Highways in the State of Washington
(1939)
Forty Years with the Washington Department of Highways
(1946)
Wikipedia:WikiProject U.S. Roads/Washington/Completion list
Wikipedia:WikiProject U.S. Roads/Washington/When each route was added to the state highway system
Wikipedia:WikiProject U.S. Roads/Washington/List of laws
Wikipedia:WikiProject U.S. Roads/Washington/Former routings in Seattle
Wikipedia:WikiProject U.S. Roads/Washington/List of pre-1964 highways
Wikipedia:WikiProject U.S. Roads/Washington/Directional signage
Wikipedia:WikiProject U.S. Roads/Washington/Highways of Statewide Significance
Wikipedia:WikiProject U.S. Roads/Washington/List of all state highways before 1970
Wikipedia:WikiProject U.S. Roads/Washington/Auto trails
Highway News index
(1951 to 1972)