Oregon Revised Statutes Occupations and Professions § 672.545

(a) The practice of any licensed profession or trade by limiting its appropriate and current custom or practice including the practice of any profession or trade for which a license or registration is required under any other law of this state including the practice of registered civil and mining engineers lawfully practicing civil and mining engineering in its various specialized branches; or

(b) The practice of geology by a person not a resident of and having no established place of business in this state, when the practice is limited to a specific project and does not exceed one period of 60 consecutive days in any calendar year, and provided the person is licensed or registered to practice such profession in another state where the requirements for certification, registration or licensing are not lower than those specified in ORS 672.505 to 672.705 and provided further that such nonresident shall file with the State Board of Geologist Examiners, on or before entering the state for commencing such work, a statement giving name, residence, the number of the license or certificate of registration of the nonresident, and by what authority issued, and upon the completion of the work, a statement of the time engaged in such work within the state.