The term "bridge resources" refers to both public and privately owned highway, railroad, and pedestrian bridges, viaducts, and culverts. The study of bridges is called pontology. Though architects have provided much valuable input into the design of bridges, traditionally bridge building has been the business of skilled craftsmen as well as academically trained engineers. When a highway project involves potentially significant bridge resources, they must be evaluated in terms of their eligibility for inclusion to the National Register of Historic Places. Most states have undertaken statewide historic bridge inventory surveys for this purpose. When identified early in a highway project, measures are often taken to avoid harm to these structures. If avoidance is not possible, historic bridges are "preserved on paper" through documentation for the Historic American Engineering Record. Reusable bridges are publicly advertised in an attempt to find them a new home. Historical Bridge Coordinator The historical bridge coordinator is a member of the Cultural Resources Unit of the Environmental Section of the Preliminary Studies Division of the Missouri Department of Transportation. His job is to address the impacts of proposed transportation projects on historic bridges and to develop ways to avoid or minimize harm to them. The position is governed by federal and state legislation and regulations. The HBC tracks the disposition of bridge resources through the continual review of the statewide bridge inventory survey and other sources of information. The HBC assures that memorandums of Agreement for historic bridges are thoroughly prepared and executed, and that all MOA stipulations are met. These stipulations often include preparation of documentation for the Historic American Engineering Record, which is placed in the Library of Congress, and advertisement of the availability of movable bridges for adaptive reuse at a new location or in place. The HBC also reviews proposals for adaptive reuse and recommends recipients for historic bridges. The HBC provides information and aid to a variety of groups and individuals at the state and local levels in regard to completion of Section 106 requirements for historic bridges. Surface Transportation and Uniform Relocation Assistance Act of 1987 (STURAA) Historic bridges in missouri Advertisements and proposals