This series contains project data gathered with the natograph which consists of original natograms and line graphs, articles titled “Cinemagraphic study of swim strokes,” “Swimming speed analyzed,” “Water resistance in swimming,” “How not to swim fast,” “The effect of oxygen inhalation on swimming performance,” “Analysis of the propelling force in the crawl stroke,” “Mechanical work and efficiency in swimming crawl and back strokes,” “Respiration in swimming and diving,” “Prediction of time in swimming breast stroke based on oxygen consumption,” “Energy expenditure in swimming,” large format posters, project notes, and research photographs.