In 2014, the Biodiversity Heritage Library curated the "Monsters are Real" Collection. According to the website,
"This collection includes the books that fueled some of history's most fearsome monster myths, as well as those that highlight the real identity of these beasts."
The BHL collection of Natural History Journals covers creatures from mermaids to the Kraken. Scan this code to see more of the collection:
We at the Science and Engineering Library, took things a step further to examine the origins of some other popular Halloween "Monsters."