Blueprint
Whiteprints
Traditional blueprints became obsolete when less expensive printing methods and digital displays became available.
Digital
Many of the original paper blueprints are archived since they are still in use. In many situations their conversion to digital form is prohibitively expensive. Most buildings and roads constructed before c. 1990 will only have paper blueprints, not digital. These originals have significant importance to the repair and alteration of constructions still in use, e.g. bridges, buildings, sewer systems, roads, railroads, etc., and sometimes in legal matters concerning the determination of, for example, property boundaries, or who owns or is responsible for a boundary wall.
Blueprint
!Blueprint for a [Butler-class destroyer escort, 1944](//upload.wikimedia.org/wikipedia/commons/thumb/2/2e/JohnC.Butler-classdestroyerescortoutboardprofile%2C29September1944%2820737474%29.JPG/250px-JohnC.Butler-classdestroyerescortoutboardprofile%2C29September1944%2820737474%29.JPG)