*Smithsonian - Balm of America: Patent Medicine Collection
https://www.si.edu/spotlight/balm-of-america-patent-medicine-collection
*Baltimore Bottle Club - gallery
https://www.baltimorebottleclub.org/gallery/
*Historical Glass Bottle Identification & Information - Society for Historical Archaeology
https://sha.org/bottle/
*Smithsonian - Cosmetics and Personal Care Collection
http://americanhistory.si.edu/collections/object-groups/health-hygiene-and-beauty
*New York Historical Society - Historical Collections - examples of many types of artifacts
https://www.nyhistory.org/exhibits/category/all/56/table/paged/default
*Dating Common 20th century artifacts
https://sha.org/resources/20th-century-artifacts/