By looking at bone thin-sections (histology), researchers can determine how many years it took a to reach its massive size. The Seven Major Groups

An open-access journal with a massive library of dinosaur research. PubMed Central (PMC) Great for papers on dinosaur physiology and pathology. Journal of Vertebrate Paleontology

by Stephen L. Brusatte. This work moves beyond simple identification to treat dinosaurs as living, evolving organisms, covering their biology from the Triassic origin to their extinction.

If you are looking for specific PDF resources, the Wiley Blackwell edition of Dinosaur Paleobiology is a primary academic source. geokniga-dinosaur-paleobiology.pdf