426 U.S. 572 96 S.Ct. 2264 49 L.Ed.2d 65 EXAMINING BOARD OF ENGINEERS, ARCHITECTS AND SURVEYORS, etc., et al., Appellants,v.Maria C. FLORES DE OTERO and Sergio Perez Nogueiro. No. 74-1267. Argued Dec. 8, 1975. Decided June 17, 1976.* Syllabus A Puerto Rico statute permits only United States citizens to practice privately as civil engineers. Appellees […]