Pediatric Research 4, 466–467 (September 1970), DOI 10.1203/00006450-197009000-00130. Primary byline includes Titus H J Huisman and Walter A Schroeder; affiliations include the California Institute of Technology. Abstract: serial measurements of G-gamma and A-gamma chain proportions in seven infants, distinguished by residue 136. Author information directly verifies the expanded Walter A. Schroeder identity.
Proceedings of the National Academy of Sciences 60(2), 537–544 (June 1968), DOI 10.1073/pnas.60.2.537, PMCID PMC225081. Primary first byline W. A. Schroeder. Author-institution indexed full text: authors.library.caltech.edu/10565/ . Page 537, opening paragraph: examination of fetal hemoglobin components in 17 additional infants found alanine as well as glycine at gamma-chain position 136. The indexed original page was inspected; the direct institutional reader returned a cache miss. No full first name or individual coauthor role inferred.