Granula was the first manufactured breakfast cereal. It was invented by James Caleb Jackson in 1863. Granula could be described as being a larger and tougher version of the somewhat similar later cereal Grape-Nuts. Granula, however, consisted primarily of bran-rich graham flour made into nugget shapes. The cereal had to be soaked overnight before it could be eaten.
- Granola is the later breakfast cereal developed by John Harvey Kellogg, renamed to avoid being sued by Jackson. Kellogg incorporated a rolling process to flake the grain, making it more palatable. It was subsequently revived in the 1960s as a somewhat similar breakfast cereal.
- Hardtack is the military and naval ration of hard bread that was also commonly soaked before eating.
- "Dansville History". Dansville Public Library. Archived from the original on 2014-03-31. Retrieved 2013-11-14.
- "Granola History". The Nibble: Great Food Finds. The Magazine about Specialty Foods. Retrieved 2013-11-14.
- "The Early Days Of Breakfast Cereal". MrBreakfast.com. Retrieved 2013-11-14.
- Greenbaum, Hilary; Dana Rubenstein (2012-03-23). "Who Made That Granola?". New York Times. Retrieved 2013-11-14.
- 1906 Recipe for Granula, Sister Amanda Witmore, McPherson, KS