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Allan M. Maxam and Walter Gilbert, PNAS 74(2), 560–564 (1977), DOI doi.org/10.1073/pnas.74.2.560 . The primary abstract describes terminal labeling, base-selective partial cleavage and size separation of labeled fragments. The original first-page full byline ALLAN M. MAXAM AND WALTER GILBERT is verified in the university-hosted paper scan hackert.cm.utexas.edu/courses/bch370/fall2014/StudentArticles/Maxam%20Gilbert%20Seq%20PNAS%201977.pdf .

Additional verified original-paper locators: printed pp. 560–561, An Example, used a 64-base-pair lac-operon fragment; the authors read 62 bases of each strand. Printed p. 561 explicitly states that the fragments end with the base immediately before the base destroyed by chemical attack. The original purine displays are strong-G/weak-A and adenine-enhanced, rather than assuming four exclusive base reactions. hackert.cm.utexas.edu/courses/bch370/fall2014/StudentArticles/Maxam%20Gilbert%20Seq%20PNAS%201977.pdf