So I was just reading about the discovery of the process to extract nitrogen from the atmosphere. Noticed this part:
In nineteenth-century Europe, gangs of English graverobbers roamed the Continent, searching for skeletons to grind into fertilizer. Justus von Liebig, German chemist and founder of industrial agriculture, claimed that England had "stolen" 3.5 million skeletons from Europe.
I wonder if the English caused the Irish famine to steal everyone's skeletons?
Now that I think of it, you don't see huge graveyards over there such as you might expect for the number of people who died.
https://en.wikipedia.org/wiki/History_of_the_Haber_process
http://rarehistoricalphotos.com/bison-skulls-pile-used-fertilizer-1870/
Bones were big business in the 19th century.