In 1976, Martin largely retired from teaching, becoming a research associate with Boston University’s Center for the History and Philosophy of Science. He made excellent use of the resulting leisure, so that his final decade of life was by far his most productive, publishing over 100 book chapters and journal articles. In 1979, he published the definitive treatment of his logic / first-order theory, Part A of "Semiotics", and edited a volume of Carolyn Eisele’s writings on Charles Sanders Peirce. He helped edit the Festschrift books for Fitch and J. N. Findlay, respectively, published in 1975 and 1985.