D. Puerto Rico March 1977 casesRuiz Rodriguez v. Litton Industries Leas. Corp.Chadbourn-Caribbean Ind. v. Autoridad, Etc.Hernandez Del Valle v. Santa AponteGarcia Mendez v. Vazquez BrunoFebo Agosto v. Secretary of Health, Ed. and WelfarePierluisi v. E.R. Squibb Sons, Inc.Perez Torres v. Secretary of Health, Ed. Welfare